I agree with Frank Zappa (adding "please don't eat the Yellow Snow"), Randy Newman (adding "Short People") and various Dr. Hook. I'd also add Warren Zevon (e.g. "Werewolves of London") and Tonio K (e.g. "Life in the Foodchain", "H-A-T-E-R-E-D").
What's the funniest song you ever heard?
This isn't misunderstood lyrics, but the actual lyrics that were funny. There have been artists who made a living writing humorous stuff like Spike Jones, or Ray Stevens to name a few, but the funniest song I have ever heard might have been "Pretty Smart on My Part" by Phil Ochs.
What's tickled your funnybone?
What's tickled your funnybone?