Going to someone who has a record of creating terrible startups and asking him or her if it's a good idea. If he or she says it's a good idea, it's probably an incredibly shitty one. The inverse is also true.
I perform the shit idea test on Ryan whenever I need to gauge whether to hack on a new app or not, just so I know what I'm getting into beforehand. Of course he doesn't know I'm performing it on him.
svhunt
LOL @GoogleEngineer, I'm assuming by Ryan, you're talking about Ryan hoover?