Adam Sandler's Left Hand -- The Unexplainable Phenomenon

Adam Sandler walked into the Ed Sullivan Theater for a guest appearance on "Letterman" this week and it wasn't very exciting... UNTIL we processed the photo in a high-tech computer (kinda like the ones on all those crime shows) and saw something startling!

Sandler (46) seems to raise his left hand in what can only be described as a waving motion the EXACT SAME WAY each time he visits the late night TV show.

Below are more examples of the comedian exhibiting the same bizarre behaviors in the same location over past years -- and we can't help but feel like he's almost trying to tell us something ... but what is it?