Haha, have you ever seen the prank where they brought "Bono's grandfather, Seamus" into a U2 show? It was back in like 2000 or something, and they got this old man to come in a kilt, GA. They actually convinced security that Bono's grandfather came to see a show.
Awesome.
I think it was on the same VH1 Pranks show, but higher up on the list.