I know I promised myself that the next movie I watched should be a comedy. I'm not sure I managed to keep that promise. Here is the list of my last 3 movies:
1) Chaos Theory. I like Ryan Reynolds, and the movie was funny, even though I can't say it was the kind of movie I was thinking about when wanting to watch a comedy. Like Christopher pointed out, Forgetting Sarah Marshall would have been more up my sleeve. Also, of course (what else) I may have cried a little. Not much, mind you, but a little.
2) Changeling. A real mood lifter...Based on a true story, involving disappearing kids, a mother fighting to get her missing kid back etc etc. Throw in a creeeeeeeeeeepy guy and what do you get? Tears, tears, tears darling!
3) Rachel getting married. Oh, my, god! Seriously, I don't know if I have stopped crying yet (I finished watching it maybe 2 hours ago).
I can recommend all of those movies though, I liked them. And as for comedy, I had saved up 8 episodes of One Piece, one of my favourite animes, and if anything can cheer you up, it's those guys on that boat! ^^