When I go out on the town, which I tend to do on Friday nights, I like to check in to places on Foursquare.  Most of the places I frequent don't have bonuses for the mayor but I like being able to see who else has checked in at the same location and where my friends around the country are at the same time.

Unfortunately, downtown DC has terrible cellular coverage and it can be difficult to get a data connection when you are trying to check in.  This past Friday I was having just that problem, fiddling with my phone trying to check in, when a hand started waving over the screen.