I'm not one for FPS games. But a buddy and mine hosted a Half-Life server for a while anyway.
So, people logged on, and I hopped in, even though I was an easy kill. But I decided to have fun. So I only used the crowbar, even if paired up against automatic weapons and rocket-launchers.
And my player model was that of Bert, from Sesame Street. This one player logged onto the server, saw a giant yellow muppet chasing him with a crowbar and totally flipped out. He started screaming into his headset, "get away from me you lazy-eyed freak!"
It totally made my day.