I go to a lot of open mics for stand-up. They're often tedious, repetitive, and frankly a little depressing, but sometimes, moments of beauty occur. Generally it's not funny on purpose, but that makes it even more wonderful. Penicillin was an accident, too, after all.
A man came up with a guitarist friend and performed a song, to the tune of "Mr. Tambourine Man", with new anti-Bush lyrics. Sample:
"Hey Mr. President, man
Show some courage for me"
It was like Weird Al mixed with Mark Russell mixed with despair. Parodies of 40-year-old songs are always a risky proposition, no matter how deft the satire. Also, "Mr. Tambourine Man" is not a short song. However, in case you were wondering, a man who would re-write "Mr. Tambourine Man" in 2007 is not a supporter of the war in Iraq.
His performance was met with polite applause, and then the singer went to tell jokes. His first moment of banter was the rim shot to the extended setup that was his whole performance:
"So I've been divorced for about five years..."