2 things: First off, "let's use Grandma as a table for our map so we can figure out where the hell we are?!?" Secondly, those bikes in front of Grandma, those are GPS-enabled rental bikes. You call the number on the bike, give them your credit card info, you get a code to unlock it, and off you go on your ride. When you're done riding, you call them and they charge you for your time (about 3 Euros/hour) and you just park the bike and it locks itself up again so no one can ride it-and the GPS system lets the company track the bikes all over the city. Impressive!