Brendan Fraser surprises Whiskey a Go Go Crowd, and supports his son after he wins an Oscar

TMZ has obtained video of Brendan and his son, leylandhaving a Monday night ball at Whiskey a Go Go in WeHo…chilling in the green room and signing the performer’s wall.

Brendan takes a few beats to find the perfect space for John Hancock’s departure, as spectators make wisecracks about his handwriting… Then Leland follows suit, also getting his nod.

People who were there told us that Brendan and his son got to the place around 9pm and saw an ’80s cover band… Leland even hopped on stage to play guitar with the band at one point.

Leland’s dad was such a hit on his whiskey that so many people came to his table to congratulate him 24 hours after he won his Oscar…and we’re told he didn’t turn anyone down. People who have met Brendan describe him as very humble.