Walking in on my cousin and his girlfriend having sex in his bathroom while a bunch of us were at his house. Like a good 15 - 20 people. It was awkward to say the least. My response literally made him pull out with laughter. Completely straight faced "Go on." To have that moment of silence broken like that made us both bust up laughing. Not so funny when I look at it on paper but the tension breaking like that did it for us.