Guerrilla Marketing

This is the first Guerrilla Marketing Campaign I see in Portugal with effective results.
I wonder how they manage to do it without getting a fine, as it seems they painted the floor in several public places (in fact from my office window I can see one right now).
Nevertheless I think it is a great breakthrough and with high impact as not one of the people (non marketing related) I spoke to about this, immediattely recognized it and after sometime completely identified what it was about.
Ah! It is a campaign for AstraZeneca and SPC (The Portuguese Cardiology Society) to make people visit their doctors more often

The copy says "Don't be the next victim, Reduce the risk. Visit your doctor." and it leads to the website www.spc.pt

reMARKable

P.S. the picture was proudly taken with my K750i phone... cooolissimo :)