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Did Adam Sandler ever bus tables and mop floors before he made it big?

Perhaps! Because the comic -- a Saints fan in town for the Super Bowl -- happily volunteered his services to the staff at STK Miami over the Super Bowl weekend.

A source tells that Sandler, 40, showed up alone at the hotspot late on Friday after closing time with a craving for sweets.

"He ordered a cheesecake lollipop dessert and a coffee," the source recounts to Us.

Sandler demonstrated his appreciation for the late-night snack with more than just a tip: "[He] started helping the staff clean up for the night," says the insider. "All the while making everyone laugh with joke after joke."

Like Angelina Jolie and Brad Pitt, Sandler watched the Saints beat the Colts from a private VIP skybox in the Sun Life Stadium on Sunday. He was also in Miami to promote his new film Grown Ups along with costars (and football fans) Rob Schneider, David Spade, Chris Rock and Kevin James.