Those topspin drills
When practicing, most players start off most drills with a simple topspin serve so they can get into the drill, whether it's a looping drill, a footwork drill, or some combination or other drill. But in a match, how often does a rally start that way? Far more often rallies start with someone opening by attacking against a backspin, the most common type of serve. So if you are relatively consistent in these straight topspin drills, you should move to a more advanced version, and start the drill by serving backspin, your partner pushes it back, you attack (normally by looping the deep pushes, flipping the short ones), and then continue with the drill. If you want to get better, you need to both push yourself with more and more difficult drills, and do drills that match what you'll face in a match.
Marty Reisman plays lobby pong
Yes, the flamboyant two-time U.S. Men's Champion passes the time ponging in a hotel lobby (1:21). And here's a clip of him winning the 1949 English Open over five-time World Men's Singles Champion Viktor "Mr. Backhand" Barna (1:50).
Rafael Nadal and Kevin Spacey playing table tennis
I think I posted this once before, but this two-minute video deserves reposting. Spacey says to Nadal, "You should be nervous because I'm about to beat you in a game that demands the physical stamina of a boxer, the agility of a gymnast, the tactical acting of a chess player." Here's Nadal again, hitting forehands
Shakehanders versus Penholders? Oops!