I bet the conversation at valve when ricochet was designed was something right along those lines too:
"Hey, how about a game kind of like tron?"
"What, you mean those cool light bike things? "
"No, no, the disks that they threw. "
"So, like a frisbee game?"
"Yeah, but with lots of decapitation. And the main point of the game is to jump, but... GET THIS: there's NO jump key! "
"Wow man, you SO crazy. "
"I know, now are you gonna bogart that crack pipe or pass it? "
"Yeah, take it, I'm just trying to refresh my creativity."
"Now, let's talk about my next plan: Single player counter-strike!"