I was listening to Tom Waddle this morning, and they were playing back a take-off on Jeff Foxworthy's "You might be a redneck if..." jokes with "You know you're a Packer fan if..." one-liners.
Waddle got off a good one, I thought. I don't know if it's original, but I chuckled.
"Did you hear that the library in Green Bay burned down last night?"
"Yeah! Both books were completely turned into ashes! (pause for effect) And one of them hadn't even been colored in yet!"