The Cat: because is a cat and a spider :) ... oh, wait.
ME-OW! I am very sorry. Just thought of it and felt like everyone should hear it. Maybe some jokes are better left untold...
Claude
Because every time he puts up a prayer it gets answered. (I thought of this myself, but it is so corny, it could easily be in every damn joke book.)
Al Kaline.
He pokmon!
Just wait 5 minutes. They'll post about it.
A: He hides in an acorn and waits for a bird to carry him up.
A harenet.
An anarchid.