She jokes

Yo mama's so stupid, when thieves broke into her house and stole the TV, she chased after them shouting, "Wait, you forgot the remote!"

Yo mama's so stupid, she stared at a cup of orange juice for 12 hours because it said "concentrate."

Yo momma so dumb, when your dad said it was chilly outside, she ran outside with a spoon.

My sister told me only onions make you cry, so I always hit her back when she hit me, but I hit her with a shoe only to catch her cry.