Play a big set of minigames to prove who's best.
alltalk, deathrun, dodgeball, friendlyfire, increased_maxplayers, neon, neonheights, prophunt, respawntimes, tf2ware, trade
Random server mode
This will pick any community gamemode (hence not official gamemode's), and choose a random server from that list with at least 5 players in it. This is the best way to get in touch with the funkiest maps/gamemodes/people!