'Diff'rent Strokes' Star Bloody After Shark Face-Off

10/26/2010 5:00 AM PDT
Todd Bridges -- the guy who played Willis on "Diff'rent Strokes" -- was all smiles recently, which is strange ... considering the guy was holding the bloody remains of a thresher shark.

Here's the short of it -- we're told Todd was on a camping trip with his son in Santa Barbara, CA ... when a nearby fisherman hooked the predator and needed help hauling it out of the water.

Todd came to the rescue -- but the shark must have been pissed ... because soon after, it completely lost its head.