Payback's a bitch ... so says Kenny "The Jet" Smith who says he's constantly looking over his shoulder -- waiting for Shaq to try to get his revenge for that infamous Christmas tree shoving.
You remember the incident ... Smith tossed Shaq into a tree on the set of "Inside the NBA" ... leaving the Big Fella flat on his ass covered in broken branches.
"I thought it would be funny ... but I didn't know it was gonna be THAT funny," Smith said.
As for Shaq's revenge, Kenny says he knows it's coming -- it's just a matter of time.
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