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

TMZ TV

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!