"Dirty" Joke

Last night a mom was picking up her little girl and was chatting for a little bit.  After my son had told her a few jokes, she asked him, "Do you want to hear a dirty joke?"

And she waited for him to answer.

Which he wasn't going to do anytime soon, he turned to me and his face was red.  He was confused.  So was I.  Now I've known this lady for a while and am pretty sure that I know what her standards are ... but still, when someone asks you that ...

She starts to laugh and tells us, "A pig fell in the mud."

Well it's dirty and got us all laughing.