dick in a box comeback
The opposite of "jumping the shark." This is an event that takes someone who is already over the hill and makes them cool again. Prior to his SnL appearance, Justin Timberlake was deemed uncool; after the DIAB skit, he regained some cred. Captain Kirk pulled a dick in a box comeback by doing the commercials for Price Line.
"Tom Cruise *almost* pulled off a dick in a box comeback in that last sequence of tropic thunder."