You know how chicks wear open toed shoes? You know why they can do that? Because they cut, polish, shape, and otherwise clean the hell out of their toenails. Like, all the time.
You, on the other hand, yes you, dude at my work with giant, scraggly, black-cheese-laden toenails, do not do that. Neither do your friends. So here's the thing, Man Wearing Sandals. Unless you're willing to put some effort into cleaning your fucking feet, do us all a favor and PUT SOME FUCKING SNEAKERS ON YOU DISGUSTING MOTHERFUCKER.
For fuck's sake. I know it's summertime. I know it's hot outside. I know that you wear sandals because it's hip and trendy. The price you need to pay for your cool feet is something we like to call "personal hygeine".
Cut your fucking toenails, or put some fucking socks on.