My favorite Steven Seagal story, from his Wikipedia page:
Seagal has been accused by former stunt performers who have worked with him, including Kane Hodder, Stephen Quadros, and Gene LeBell, of intentionally hitting stuntmen during scenes. Additionally, while serving as stunt coordinator for Out for Justice, LeBell allegedly got into an on-set altercation with Seagal over his mistreatment of some of the film's stunt performers. After the actor claimed that, due to his aikido training, he was "immune" to being choked unconscious, LeBell offered Seagal the opportunity to prove it. LeBell is said to have placed his arms around Seagal's neck, and once Seagal said "go", proceeded to choke him unconscious, with Seagal losing control of his bowels. Seagal bodyguard and stuntman Steven Lambert stated he was present and said that a confrontation did happen, during which Seagal elbowed LeBell before he could lock the hold on Seagal, after which LeBell flipped Seagal.