Not to mention "Happy Family Planning", which manages to make suicide funny.
If this episode were the basis of the whole anime, it would be the single funniest anime ever.
The little girl's face when the old man suggest various ways they can die.
The best part: when they're at the lowest, the suicide group wonders if Lil' Slugger might be able to kill them. Their despair summons him... and then when they cheer up, he freezes up and runs for it (the lack of anxiety, possibly combined with their being dead already, throws him off). So they chase down Lil' Slugger.
When they're about to jump in front of a train. The guy who jumps before they do actually gets off the tracks, muttering about how much that hurt, and how hard it is to die these days.
Their failed attempt at hanging themselves.
Then there is the episode "Etc."; several of the stories told by the Gossipy Hens are hilarious.