I worked at a Subway for about 7 months, so I have tried pretty much everything they have to offer. There is a huge difference between the worst Subway sandwich possible and the worst sandwich you could order. I think that the single worst item you could order would definitely be the crab (seafood sensation) on a wheat bread. Do not toast. Ask for cheddar or pepper jack cheese. Add olives, pickles, sweet onion sauce, oil and vinegar, and mustard. Out of all the ingredients at Subways, if they do offer the crab it is guaranteed to never be fresh. That shit lasts for weeks. In my 7 months of working there I think I saw 3 people order this sub. Nasty. Now for the actual worst Subway sandwich possible. One night, I was working the closing shift with another teen around my age. We were both about the age of 16/17. We were pretty good friends so we would always dare each other to try and make unconventional combinations. They were never really too awful though: tuna and bacon? Pretty good. Meatball and triple cheese? Pretty good. Veggie patty? Pretty food. But on this one slow ass night, he dared me to make a sub that had one of each kind of meat on it. Disgusting. I had to do it. I layered roast beef, salami, pepperoni, turkey, ham, buffalo chicken, teriyaki chicken, a scoop of tuna, and half a meatball onto a 6 inch Italian herb and cheese sub (for some reason we were only allowed to make our own subs on 6 inch breads). I can't exactly describe the flavor too well, but it came off with a strong opening note of meat and not much else. 4/10 sandwich. Very hard to eat. Still finished it tho