Dr. Venkman wrote: Harrison Ford has "secret hammer muscles", which is a condition closely related to "retard strength."
Any drummer worth his salt will inevitably possess similar qualities. Unless you're curious what a paradiddle would feel like on your face, never engage a drummer in a fair fight. This also goes for roofers, blacksmiths or any other guy who pounds on things for a living.
If it seriously comes down to it, enlist a buddy to distract them momentarily, then cold-cock'em when they're not looking.