This morning my son told me that he'd learned a new Backyardigans song called, "Who the hell are you?" I doubted that there was such a song, and he told me that it was different Backyardigans, going on to tell me all about the parallel-universe characters in that version, and even "singing" a bit of the song.
When we discussed that those are words we don't really say, he was very worried about Santa, which confused me. Turns out he believes (don't know whether it's true) Santa says, "Who the hell are you?" in the movie, Elf. If it's true, thanks Favreau. If not, my kid really is sneaky.