I usually don't do these on CSn Servers because I actually like playing against you guys, but when I'm on a server that's just bad and I'm bored I'll occasionally just mess with people.
Along with the Spycrab there are:
Dirty Aussie: Crouching around the map as a Sniper and scoping so it looks like I'm humping the air.
Awakened Bear: Walking slowly across the map as a spun-up Brass Beast Heavy spamming voice commands.
Buzzing Scout: The classic of jumping around the map spamming "Needa dispensa here!"
Athletic Pyro: Get the Ball Kicking Boots for Scout, spawn the soccer ball, then chase it around the map using compression blast. (I usually do this on CSn if there aren't enough people on the server to play for realsies.)
Friendly Sanvich Heavy: Running around the map with my Sandvich out and dropping it all over the place, for both my team and the enemy to pick up.
Everybody gets bored.
Any other creative ones?
