Blake Griffin -- OPEN MIC NIGHT ... At Legendary Comedy Club

What do Blake Griffin and Michael Richards have in common? They both tested their comedy chops at the Laugh Factory in Hollywood. Safe to say, one went better than the other ...

The L.A. Clippers superstar appeared at the legendary Sunset Strip comedy club to perform at open mic night ... and decided to read some of his "Slam Dunk Poetry."

Griffin's been reciting some of his work -- inspired by snap-off warm-up pants, mouthpieces and bobblehead dolls -- as part of an ad campaign for Vizio.

Now, it seems he's taken his show on the road. And so far, people seem to be diggin' it.

At the very least ... his comedy club debut went better than Kramer.