sex warehouse

I was at my post office in DC when this guy walked in sashayed in singing "he's a maniac, maniac on the floor, and he's dancing like he's never danced before" over and over and over and over again. Then, when he got called up to the window, he seamlessly merge into "...never danced before, cause he's a maneater, watch out boy he'll eat you up, whoa here he comes, he's a maneater." Who does this?