The Everybody Loves Raymond star was leaving a Los Angeles restaurant on Sunday night when the incident occurred as he was surrounded by the paparazzi.
Things appear to get heated when one photographer starts shouting insults at Garrett, only for the actor to shout back, 'Excuse me?' before slapping the camera.
According to Web site TMZ.com, where the footage has been posted, the photographer suffered a swollen eye when the camera was knocked into his face during the skirmish.
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