Suge Knight K.O. Kid -- Violently Choked Out

7/26/2010 12:05 PM PDT BY TMZ STAFF
Greg the Barber -- the guy who famously knocked out Suge Knight -- was choked out in a violent nightclub altercation ... when a bouncer ran up from behind him and put him in a sleeper hold.

** Warning: This footage contains explicit language and violence **

The footage -- first posted on Friday by -- shows Greg conducting an interview for some sort of Internet show in front of Wonderland in Hollywood ... when a bouncer knocks into him from behind.

Clearly upset, Greg aggressively confronts the bouncer -- when ANOTHER bouncer rushes in from behind and puts a death grip around Greg's neck ... until he passes out.

When Greg wakes up, he tries to find the man who attacked him ... even throwing punches at one point.