Zac Efron: I Got a 'Monkey' on My Arm ... In a Bar

Zac Efron was hanging at a Florida pub Saturday night ... with a monkey-like creature on his arm.

Zac was shooting "Baywatch" in Boca Raton, hanging at an Irish pub for the night, when a random patron walked in with a Kinkajou. Zac took to the rainforest dweller -- called a "honey bear" in Central America -- and got handsy with it.

The Kinkajou has a propensity to drink people's drinks ... so you gotta see this one in action.