I'm sure we all really believe we are someone's biggest fan, but do you really know your idol as well as you'd like to think?

On his show, "Late Night with Jimmy Fallon," Fallon sends New York Mets All-Star pitcher Matt Harvey to the streets of New York to ask fans what they think of Matt Harvey.

Little do they know they're speaking to the real Matt Harvey.

With Harvey still being fairly new to the New York baseball scene, these unsuspecting fans don't realize who is actually conducting the interview -- which leads to some hilariously awkward moments, such as when one fan confesses to seeing the pitcher posing naked in ESPN magazine's Body Issue ... and realizes a few seconds too late that that same man is standing right in front of him.