[VIDEO] Chevy Chase Falls Off Stage At “Christmas Vacation” Event

During the festive season, Chevy Chase made a grand entrance at Shea's Performing Arts Center in Buffalo, NY for a special screening of the iconic Christmas classic, "National Lampoon's Christmas Vacation."

And in true Clark Griswald fashion, Chevy took a spill right off the stage!

Watch the video:



From TMZ:

For some reason, Chevy was rolled out onstage in a wheelchair, but quickly stood up and started walking toward the crowd ... before suddenly dipping out of sight, as he stepped right off the stage!

He eventually got up and back to his seat onstage with help from his wife, Jayni, and the Q&A's host ... and the whole room had a laugh when Chevy's smartwatch called him out for his tumble!

Folks in the audience told us he ended up doing the event with an icepack on his knee but still stuck around to snap some pics with fans and answer questions.

Sources close to Chevy tell us he simply misjudged the edge of the stage when walking out -- saying the stage lights on him blacked it out ... but he's doing just fine, apart from a bruised knee.

Well it's good that Chevy only winded up with a swollen knee and perhaps a bruised ego. 

Could've been a lot worse!