When you've been in Hollywood as long as Michael Keaton has, you've probably seen a ton of weird stuff created by fans -- a lot of signs and strange drawings and maybe a wacky letter here and there -- and although that sounds a little off-putting, Keaton is into it. At least, he's into it when your fan art is good, as was the case with a 'Beetlejuice' tattoo he spotted during a late night shoot on his upcoming 'Birdman.'

The actor hit 'The Late Show' last night to share some of his filming stories with host David Letterman, including the time he saw the best 'Beetlejuice' tattoo ever. Keaton was totally struck by the experience...the guy with the tattoo, though? Eh, not so much.

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