I love this picture!

Ross: It matters to me!
Chandler: Why?
Ross: Because the night you kissed Rachel was the night I kissed Rachel for the very first time!
Chandler: You kissed her that night, too?
Monica: Two guys in one night? Wow, I thought she became a slut after she got her nose fixed.
Chandler: Seriously, where did this happen?
Ross: Okay, after you told me she was passed out in our room, I went in there to make sure she was all right. She was lying on my bed, all buried in people's coats. Well, I went to kiss her on the forehead, but it was so dark I accidentally got her lips. I started to pull away, but then I felt her start to kiss me back. It was only for a second, but it was amazing. And now... now I find out that you kissed her first!
Chandler: Uh, wait, what bed did you say she was on?
Ross: Mine.
Chandler: I'm pretty sure I put her on my bed.
Ross: No, she was definately on my bed.
Chandler: Why would I kiss a girl and then put her on your bed?
Ross: Well, then who was on my bed?
Monica (horrified): Oh! Oh! Oh!
Ross (realizing): No! No! No!
Monica: Yes!
Ross: You were under the pile of coats?
Monica: I was the pile of coats! You were my midnight mystery kisser?
Ross: You were my first kiss with Rachel?
Monica: You were my first kiss ever?
Chandler: What did I marry into?