It's called a rear-naked choke and it was employed to perfection by a passenger on a recent Ryanair flight which had landed at London's Luton Airport.
The jerk was a drunk 22-year old who had been annoying other passengers for the entire two-hour flight. When airport security and airline employees tried to intervene the idiot would have none of it. So, another passenger, who clearly had some training, had a "Popeye Moment" (you know, "I've stood all I can stands and I can't stands no more!") and he simply ended the problem to the delight of the other passengers.
Of course, being Europe the hero will likely get sued, but that is another story.