Shaq and 'Kim Jong-un' -- Best (Worst) Katy Perry Sing-Along (VIDEO)

Here's Shaq showing that no matter how bad he does something ... it's still pretty flippin' awesome.

The big fella teamed up with Randall Park -- star of ABC's "Fresh Off The Boat" -- and busted out a rendition of Katy Perry's "Firework." Shaq was shooting a cameo on the sitcom, and couldn't resist doing a reenactment of Randall's scene from "The Interview."

We'll refresh your memory, since almost no one saw the movie ... Randall played Kim Jong-un and sang the hit song with James Franco.

Check it out ... Shaq's vocal tour de force is at least as good as Franco's.