Shirtless Reyes. Because why? Because it was a character establishing moment, and set the trend for Monica basically running around in sexy undies on camera for a whole season. Whereas Scully got naked once, and we didn't see an inch of skin again until like season 7.

The less said about naked Skinner, the better.

I would like to point out that Speedo!Mulder should absofuckinglutely be on this list.