Limericks don't come from Limerick. But it comes from that between the verses when they used to have those competitions that they would put in the refrain, "follow me up, follow me up, follow me up to Limerick Town. "
I think the first time I really heard poetry was in the schoolyard. Just the little limericks that kids say when they're jumping rope and playing games. I think that's the first time I heard rhyming words - I don't know if I'd call that the definitive poetry, but that's when I heard rhyming words said and not necessarily sung.