Conor McGregor uncorked a shot to the head of an elderly man in an Irish bar in a dispute over whiskey -- Conor's whiskey -- and TMZ Sports got this video showing the violence. SUBSCRIBE -- http://po.st/TMZSportsSubscribe About TMZ Sports: Some of the best stories in sports have been off the field and we’re reporting on athletes from NFL, NBA, UFC, WWE, MLB and more! Subscribe to TMZ Sports on YouTube for the latest news, exclusive interviews, clips from TMZ Sports on FS1 and videos of your favorite athletes and celebs. Need More TMZ? TMZ Sports Website: http://po.st/TMZSportsWebsite LIKE TMZ...
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