So this was a few years ago in high school but my friend and I were on our off and decided we wanted some food. Me being the broke high schooler I told her I had to run home to grab my piggy bank to fish some money out. She stops in front of my house and I run inside through the garage. To get to my room I have to pass my sister's room. I pass and see some movement and had to do a double take. My sister and her boyfriend were doing it right there, with the door open. I scream "OH MY GOD", quickly run to my room, grab my piggy bank and try to dash out the front door as soon as possible. Somehow she intercepts me at the door half naked and puts her arms around me to stop me from escaping. "Don't tell mom or dad" she says as shes trying to pull me back in the house. I stare her in the eyes and tell her I never want to talk about this again.

She was so worried that I would tell our parents that she said her boyfriend and her would take me out for ice cream to "talk about it". I declined and never said another word about it.