Knock-Knock

Last night after church, we were eating dinner. Isaac decided to tell a joke.

Here goes:

Isaac: Knock-Knock
Mommy: Who's there?
Isaac, giggling: Toilet!
Mommy: Toilet, who?
Isaac, big giggles now: Toilet in the house!

We all laughed and told him that was a "good one." Then I asked him where he learned this joke.

And he told me. . .

CHURCH!

HUH?!