Yo Mama - Brainstorm

Yo mama so stupid, her brainstorms are more like drizzles.

Stupid Friend

My friend is so stupid, he thought General Motors was in the army.

Trouble with R

A young schoolboy was having a hard time pronouncing the letter "R," and all the other kids were, of course, teasing him about it. To help him out, the teacher gave him a sentence to practice at home: "Robert gave Richard a rap in the ribs for roasting the rabbit so rare." In class a few days later, the teacher asked the boy to recite the sentence out loud. The boy nervously eyed his classmates -- many of them already laughing at him -- then replied, "Bob gave Dick a poke in the side because the bunny wasn't cooked enough."