re: What would you think if PGA assessed a penalty on Sergio?

This is off-topic but I didn't feel like it warranted starting a new thread.

What would happen if a fan intentionally moved a ball? Like let's say it's a playoff and a guy tees off and goes WAY off into the woods, and a fan in the woods who likes the golfer just picks the ball up and throws it right down the fairway. Now obviously teh fan would be escorted out and never allowed back, but I mean as it relates to the golf. Is that just "one of those things" and they just roll with it, or woudl they look at film and try to place the ball back to its original spot?