Classic Grady, I wonder if Brady from Halloween 4 was inspired by him. They sorta look alike

I asked myself the same question, but then I remembered
It is established during the cafeteria scene they ask Grady if he's going to the party, and (while his mouth is full) he says he can't because he is grounded. They ask him why, and he says he pushed his grandmother down the stairs.

1. Hates Coors with a passion
2. Strict anti-gun positions with regards to glass cabinets
3. Tiki torches do not mix with his hair product
4. Can't swim
5. Grounded thanks to that fight at school
6. Early night so the next day he can be the first A.C. Slater
7. He's actually really sick, unlike his older brother, Ferris.

Word Kerry was all his and he wasnt even interested so she had to Floozying around at the pool party for lack of a better term that would perhaps see this post deleted

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I get the feeling "pushing his grandmother down a flight of stairs" was a wise ass comment and he really just didnt want to go because he wanted to listen to Limahl all night and stare at his poster

You pretty much answered your own question.

LMAO! I remember when Grady said that! This movie is so off the hook and hilarious!

He pushed his grandma down a flight of stairs. Seriously.
The beep has got to go. Go! The beep gots to go! -James Franco