Zipcar recently conducted a witty new ad experiment on the sidewalks of Washington, D.C.: On two of the city's busiest corners, it installed "street scenes" depicting exactly why you'd need to sign-up for the car-sharing service. As Anthony Marinos, a D.C. region marketing manager for Zipcar, told PQ Living, "It put a smile on people's faces." Nicely done--especially when so many corporate guerrilla campaigns end up so lame or so annoying.

[PQ Living via PSFK]