I have several that I like to tell, but my favorite is from high school.

I played football and during the off season the coaches made us run track. I wasn't really fast but I was fast enough to make the varsity team for the 100m sprint. The thing about track meets is they are all day, sometime two or 3 day events. Days waiting for one race that takes just seconds to finish. It can get boring. Anyways to set the scene, I went to a very undiversified suburban school(in this part of Texas this means the majority was Hispanic with very very few black or white students, and this is second track meet of the season and the majority of the team there are from the more urban and black community areas . I go and check in with the race officials and they give my heat and lane assignment. I walk to the benches where we line up and wait until we can move to the track. Its an 8 lane track, and there are 9 heats in group, 72 people and I am the only white kid and there are maybe 5 Hispanic runners as well. Its rather intimidating.. They seat us and start calling names to check one last time before we move to the starting area in like 20mins. I decide that I'm going to have some fun with this situation. They call my name and school and I answer back in a heavy German accent(to be clear I grew up in Texas and speak very little German). Then ask the official a few questions while struggling to find the words or to understand their answers. Within minutes natural curious takes over and the guys in my heat and some sitting behind me start asking questions. "where am I from" and all that, and then questions start coming about "how I like it here" and things of that nature. One asks "if I like Texas girls", and I responded in fake broken english that "they are pretty but prefer German girls because American girls no like to have as much....(act like im struggling to find the word then instead mime the act of humping), laughter ensues and the group doubles in size as more guys gather around listening to me. After telling them about girls being less prude, explaining the drinking age and how short of a trip it is to places where weed is legal(claimed to be from Essen ) , the group of guys talking to me is like" girls put out more, dont have to be 21 to drink and weed is legal just a train ride away, we need to go to Germany" Then just as we are about to go line up on the track, a pole vaulter has a really bad fall and lands on their neck, they shut the whole meet down for almost an hour and half, as they bring in an ambulance and take him away. This leaves me stuck being German longer than I had planned, and I am feeling a bit reckless, and as you can imagine in a group 60 black high school boys, the N-word is flying around alot between each other. Its all good-natured, in use and not hostile. So I turn to one of the guys who has been talking to me most, his name is Aaron. I ask him "OOron, I keep har-ing woord I do nut ooonder-ston"(aaron i keep hearing a word I do not understand) He replies "what word is that?" I answer in the heaviest accent so that he has trouble figuring out what I am saying "Zeeger" (nigger). Aaron has to have me repeat it several times before he gives up trying to figure out what I am saying and we drop it. Not 5 minutes go by and he loudly says to one of his friends "aw nigga come on" I burst in "Aaron, Aaron, you say the word I do not understand" and finally he says "Nigga?" his voice raising softly at the end making it a hesitant question. "YES NIGGER" I respond loudly as if excited he finally understands me. Like some kind of magnetic force, every single head turns and looks at me. (oh fuck i think, Ive taken this too far, I'm going to end up painted as a racist and get my ass beaten) Then Aaron throws out his hands palms out as if pushing back the slowly closing crowd "He's from Europe, He dont know he cant say it" Like a weigh has been lifted i can breath again as lot of them laugh. Then Aaron attempts to explain it " you can't say that word"... Me- "why".....him- "its a racist word".... me- "race...yes we run the hundred"...more laughter..... him- "no, no its like a cuss word, like shit, fuck, ass, damn".....me- "oh you cuss him" gesturing at his friend.... him-"no, no I can say it because we are the same color and friends, its a bad word for black people" point from his skin to his friends..... finally we are line up to race and I get beat badly by everyone in my heat.
After the race I am still talking to several of the guys from earlier, and my coach walks up to ask me something hears me speaking in a fake german accent to a bunch of people, and just shakes his head and walks away. I spent the rest of the meet in character. Aaron and I hung out, talked, picked up girls (sorry ladies but its sad how much an accent and being foreign, effects your attraction to someone). The next track meet is a 3 day event, and my friends and classmate had seen me pretending to be German or had heard about it, and so they push me to do it again this meet, often having to walk away to keep from bursting out in laughter as I talked with people from other schools, flirted with girls, and even convince a french exchange student who speaks German, that I cant understand their German, as they are picking up an American accent and mixed with their natural french accent is making it too difficult to understand,(obviously I quickly disengaged from that conversation).
It quickly became a spectacle that students from my school would come watch, over the weekend long event. Then the next meet came, and Aaron as there and saw a runner in our schools uniform and asked where the German foreign exchange student "Sofa_king_we_Todd" is. The freshman who wasn't at the other meets answers him "sofa_king_we_todd_it isn't German he grew up down the street from me"......... So there I am streching on the infeild area waiting for my race in a half hour or so. I see Aaron walking towards me and I wave and call out "GUTEN TAG" (good day)... his face goes hard and brow draws together.... He yells "Zigger, Zigger, dont give me that guten tag shit" still walking slowly towards me......Im panicking now, I look to run towards a group of coachs or fat school constable at the meet, they are all too far away and as I know from the last race Aaron is way faster than me, I start to get up off the ground.... He yells again "Zeeger" then his angry mask breaks and he starts laughing " Zegger... racist... yes we run the hundred," he mocks me his voice shadowing my fake accent, then he says "thats the funniest thing ive ever heard, youre lucky I dont kick your ass, lets go mess with some people and we can do the zigger thing again. Which we did and did every meet that year where we were both at. Eventually my whole team and coach were in on it and would go along with it. Aaron and I are still friends to this day. (as a side note he still calls me "his Zeeger" street cred?) I apologize if any of this comes off as racist, or anything like that and to be clear I messed with all races and genders during that track season.