Paris-why not?

I visited Paris in May this year and whenever I travel I watch public advertising pretty closely, though not with the intention of doing any work. Its a flaw and I know it but thats the way it is. Given that, I could not resist the temptation when I realized that mere magnets held the plastic covers over a large portion of street level small billboards in the downtown area. I stole a few posters and grabbed some supplies from a local arts and crafts store and made a series of these on a public ping pong table. Why not?