Oh! Holy
High School unpopular guy who sees ghosts (his only friends), but is ignored by all his classmates. Perfect Strong Smart School Rep Girl who is mad for the guy nobody notices--her first love. Hilarity ensues as she courts him and he's clueless. This is a lot of fun!
Debusen
This is one of the weirdest, funniest things I've read. Insanity.
Bokura no Funkasai
Badluck
If you like comedies, you will kick yourself if you don't read this. Yes, the art is really rough, but give it a chance, because this is the most hilarious damn thing! A girl and her school friends are on a quest to find the person who can lift their curses. And these are weird curses, too. Genetic curse gift passed from Papa to Daughter. No lie, you will die laughing.
Boy Skirt