Contact Music quotes the 19-year-old Brit admitting he's been suffering from the so-called "Michelangelo's David Effect."

"He [David] wasn't very well endowed, because he was fighting Goliath," says Dan. "There was very much that effect. You tighten up like a hamster."

Uh...hamster?

"The first time it happened, I turned around and went, 'You know there's a thousand people here, and I don't think even one of them would expect you to look your best in this situation.'"

Well, look at it this way, Daniel...yeah, it sucks about your knob and all, but you'll have about $60 million in the bank by next year between this and the Harry Potter flicks.

Although, don't expect to get a tip from Mickey Rourke anytime soon.