Greg Veen posts a photo on Flickr of a poster that says "Can't Sleep Clowns Will Eat Me". This is a Simpsons reference (a little bit of research confirms that Alice Cooper wrote a song called "Can't Sleep, Clowns Will Eat Me"), and it comes from the episode of Lisa's first word. After Homer builds a bed for Bart—because Bart has outgrown his crib and needs to make room for Lisa, about to be born—in the shape of a clown, a clown that is very scary-looking and which Bart imagines says to him "If you should die before you wake" followed by maniacal laughter, Bart is seen grabbing his legs in front of the TV the next repeating to himself, "can't sleep, clown'll eat me".