From the all night dance clubs of the Castro to the funky dives of the Haight to the hipster lounges of the Mission, San Francisco has no shortage of nightlife offerings. But if you want a brand of late night living that's tried and true, come back to the old country with a visit to Johnny Foley's Pub.Johnny Foley's — Photo courtesy of Tom Molanphy

As the saying goes, when it ain't broke, don't fix it. The Irish have been laughing and partying for generations, and the reason for their hilarity is simple. They've known for an eternity that the best way to forget your troubles is to go elbow to elbow with strangers who will soon be friends, swapping stories and pints the whole night long. So put down your iPhone and pick up a Guinness and try "friending" someone the old fashioned way: buy them a beer. If you decide to do this at Johnny Foley's, the payback will be a night of revelry you won't soon forget. Besides wall to wall people ready to have fun, the bar also offers traditional Irish fare like bangers and mash, as well as live music on most nights. Located right off of Union Square in the heart of downtown, Johnny Foley's is one of the best places to leave your heart in San Francisco.