Childhood song jokes

My cousin said he wonders why people have sex with animals, and now I can’t stop thinking about it.

Ol’ McDonald had a farm e-I-e-I-oh.

It did not rain very often when Chuck Norris was a kid.

Why?

Because his favorite childhood song was "Rain Rain Go Away."

What was Stephen Hawking's favorite childhood song? "The wheels on the chair go round and round....."