There was a certain Dinosaur Comics strip some time back where T-Rex talked about asking lots of people what they did and didn't regret doing in their lives, and creating a "Regret Index" for each possible action so he'd know how likely he was to be sorry.

Well, Dinosaur Comics creator Ryan North went and made that dream a reality, with an online Regret Index where you can vote on things like whether it's a good idea to mix beer and liquor (.4 regret). Loving Batman, for example, has a regret index of 0, signifying absolutely no regret, while missing Free Comic Book Day (again) has a very high .72 regret index, meaning almost 3/4 of people wish they'd gotten their asses out of bed last Saturday. If only you'd known about it before.