Pillows, eating of
There was a kid at primary school who claimed that he dreamt that he was eating a giant marshmallow and when he woke up, he had eaten his pillow.

I didn't know that this was a widely-known joke until recently when I was perusing a children's joke book.
written by an*nymou* us*r, approved by Susan

Of course, when we said pillow-biter it meant something a lil' different.
written by gr*ff ., approved by Susan