Black Hammer Brewing is hosting "Hopped Up" Trivia Night every Wednesday, and it won't cost you a dime to play. That's right — a San Francisco establishment offering something for free, no strings attached, no $47 "service fee" tacked on at checkout.

For the uninitiated, Black Hammer is one of the city's solid craft breweries, and weekly trivia is exactly the kind of low-key community event that makes a neighborhood feel like, well, a neighborhood. No government grant required. No nonprofit overhead. No task force to study the feasibility of people having a good time on a weeknight. Just a local business investing in its community the old-fashioned way: by giving people a reason to show up.

This is the free market doing what it does best — creating value, building community, and yes, selling a few pints in the process. Everybody wins. The brewery gets foot traffic on a historically slow night, and you get to argue with strangers about which president was left-handed while nursing an IPA.

In a city where a casual night out can easily run you triple digits, a free trivia night is practically an act of fiscal rebellion. Gather your smartest friends (or your most confidently wrong ones — they're more fun anyway) and head to Black Hammer on Wednesday.

Because honestly, in this economy, "free" might be the most beautiful word in the English language.