The setting was a rock concert for the Grand Funk Railroad. After playing for some time, just after a featured guitar solo, someone near the front of the crowd began booing loudly. In response to the booing, a member of the band came to the mike and asked, "If you think you can do better, come on up here."
Up walks Eric Clapton.
- A standup comic is bombing during his routine when he starts to get heckled by someone in the crowd. The comedian goes a couple of rounds with the heckler but quickly runs out of material. He says, "if you think you can do better, why don’t you come up here and try."
Up walks Robin Williams.