Seeing Alicia's Mom

I forgot to tell Alicia I saw her mom a couple days ago.

In a porn video!

Porn video
Mom
Day
Your mom
Mother
Alicia

Explanation

Explain Bear

Listen up, smooth-brain. The joke sets you up to think the speaker had a nice, normal run-in with Alicia's mom, but then hits you with the fact that they actually saw her in a porn video. It's funny because it's awkward, crude, and way over your head. Get it now, kid?