Shaquille O'Neal: I'm Jamaican Now! Watch Me Go Undercover!

This is pretty damn funny ...

Shaquille O'Neal went undercover for Lyft -- and duped a bunch of unsuspecting riders into believing he was a rasta, a soul brotha, a Frenchman, a biker, a hipster and a nerd ... and NOT really Shaq.

The highlights ...

-- Shaq calls himself the greatest free throw coach ever and gives a mid-ride tutorial

-- Shaq says "Kazaam" is the greatest movie ever made

-- Shaq disses the ATL Hawks

-- Shaq throws a hissy fit when a rider says her favorite Laker is Kobe

You gotta watch the clip -- especially when Shaq does the whole "reveal."