Dustin Diamond -- After Screech's Knife Arrest ... 90s TV Nerds Be Trippin'!

Screech from “Saved By The Bell” getting busted for allegedly stabbing someone is bad enough new for 90s TV fans -- but Urkel's reaction to the arrest only makes things worse.

With all the switchblades and n-words flying ... one can only hope Cody from “Step by Step” is keeping his nose clean!