Blame it on the beard. David Letterman and Dick Van Dyke are both titans of comedy, but Letterman reveals he was recently mistaken for Van Dyke — who is 21 years his senior — by a "fan" on the street.
Add Yahoo as a preferred source to see more of our stories on Google. David Letterman, left, Dick Van Dyke, right. He needs a spoon full of sugar. David Letterman revealed that a “fan” recently ...