When I left work today, I notice my co-worker’s car has a “Mystery Spot” bumper sticker on it. Mystery Spot is a popular tourist destination in San Francisco bay area. I see it on the freeway all the time as well.

Every visitor who visit Mystery Spot receive a bumper sticker as a souvenir. I am sure they plan to use this souvenir to ask their visitors to advertise for them…. for free (they wouldn’t tell you that, of course). It is a simple bumper sticker, just yellow background with black text.