Hmmm. This was similar http://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc6/270631_2211703889451_1153118283_32635219_5395013_n.jpg on Tsarigradsko.

A lot of times in Sofia when ad agencies don't have enough clients to fill up their advertising space they give the space cheaply/for free to people for a practical joke.