One Team, One Sniper, 7 Spies.

This is a group based on the idea that too many spies, while a bad thing, can be downright hilarious. Especially when there's only one or two of any other class (Except for Scout, obviously) and everyone else are Spies.

Imagine this: On BLU, there's a Sniper and some other guy. On RED, there's 5 or 6 other people, including a RED Sniper, killing them over and over again. Those are the teams.
The RED Sniper challenges the BLU Sniper to a 1v1.
Suddenly, some members of this group join, and all enter the BLU team.
They all choose Spy, and disguise as our friendly Sniper.
Now, since you can't tell them apart by much, it's a 1v6 and BLU is winning.

That gives you a general idea of what I usually want to accomplish here. If possible, we should arrange this kind of thing before we enter a server, but we could also go in blind. Well, wish you luck!