Previous band that I was in....the band leader would always just "make up crap" on the spot, just to get people's attention.
Like...every gig was my birthday. If the crowd seemed to loose interest, he get everyone's attention after a song, and announce that it was my birthday. Then he'd lead everyone is a round of "Happy Birthday to You"....then the free drinks would start coming!
Just little stuff like that.
He'd always get the license plate number of someone in the parking lot during a break, then make some sort of announcement about the car...like "Sorry we backed into your car while we were backing the van in..."
Anything to get a rise out of people, all in good legitimate fun.