He would show up as a waiter at the Friars Club.
A few entertainment biggies and comedians would recognize him...Then he'd disappear again.
That would be more his style if it were a hoax.
No way anything as tawdry as the internet.
Bingo. I see a couple of those. Let the buzz build. Then, something HUGE. I had this thought. Andy shows up at the All-Star game as the behind the plate ump (hence the mask). First inning, a couple of bad calls. Progressively worse calls as the evening goes on. Calling a home-run hitter out because he stepped out of the batter's box. Throwing a "local" favorite out because his pants were too short, stuff like that. By the eighth inning, EVERY call is a BAD call. The fans are booing like crazy, to the point of throwing stuff on the field. Finally, after the game, Andy reveals it was him all along.