Their lead singer, formally known as Rudy Martinez, was a really nutty guy who legally changed his name to question mark(?) and thought he was the messiah of an alien race from the future.
Perry: "It's a quenstion mark you idiot, now go back to grade school you shameless idiot."
The '?' is used in the place of the work 'What' which would be the obvious responce.
Frank: So I finally talked to Jessica.
Instead of saying "and?" Joe uses the "?" command.