Sam's 58 Club

Okay, so we've only been there a couple of times and there's one thing about Sam's 58 Club that has always bothered us: what's the 58 for? We like to know everything we can about our local bars and that 58 has perplexed us for quite a while. There's no 58 in the address, no 58 beers on tap, no 58 anything; we keep meaning to ask someone that would know, but we're always a little too drunk to remember. Oh wait, 58 shots! That has to be it.