There’s the hard sell, and then there’s this:
Because of a nuclear disaster in 1986, across Belarus, Lithuania, and Poland one can find roaming herds of radioactive bison that are just doing their thing — eating and hanging out with non-radioactive bison, and occasionally getting eaten by wolves or prodded by scientists. This is their story. Radioactive Bison is a one-hour live-action game for 8-19 players in a large room (or a grassy field in Belarus).
I guarantee you that this would be the stupidest thing in the world to do, except for one thing: late Saturday nights at gaming conventions. This would be perfect for that, especially if everybody had a couple of drinks at dinner earlier. You’d end up with a dozen or so people milling about in a room, trying to have philosophical conversations where every other word was “moo,” while whoever was running this thing would be trying to come up with ever-stranger things to have the players do until the hysteria came over all of them like a pitiless wave.
This is one of those concepts that you can’t force, though. It works, or it doesn’t. And if it does, it can’t be duplicated, only remembered afterward, wistfully.