That one person that does not belong
No matter which way you figure it, if you're in a group of usually 3 people, theres always a third wheel:
2 Guys & 1 Girl = Usually 1 too many guys
2 Gay Guys & 1 Girl = Should never happen EVER
2 Girls & 1 Guy = 99% chance theres 1 too many guys, BUT THERES STILL A 1% chance of this turning into the best night of his life!