I don't know if I can find it on youtube but the one scene in friends where Chandler and Joey lose Ross's son. When they go to get him back they decide to do a coin toss to decide who is Ben. But like when they decide what it side is for which baby, Joey says "Oh oh Ducks should be heads because they have them!"
Chandler whips around, deadpan, and says, "What kind of fucked up clowns went to your birthday parties!?"
I'm not the best at explaining but I remember this scene absolutely killing me the first time I watched it.