Clipper Darrell -- the most famous L.A. Clippers fan -- was knocked out during an altercation at a game on Monday ... new video, obtained by TMZ Sports, shows.
In the footage, you can see Darrell -- real name Darrell Bailey -- in his famous half-red, half-blue suit ... standing with a Crypto.com Arena security guard following the Clippers' game against the Boston Celtics.
The two seem to be in some sort of argument ... where the man wearing a red polo appears to be preventing Clipper Darrell from moving through a concourse at the NBA arena.