Well, one of the main "bad things" for tourist are thiefs. Sometimes, in popular places they are working according to such a system - one man is selling some stuff like a normal vendor, right on a street. read more
This must be some tourist. Don't take offense. It's just how we are. EDIT: The answers below (or above) have stated the Arbat Street traps and other various ones in Moscow. Arbat is very, very touristy. I mean, my friends and I hang out there sometimes but we avoid buying anything there because prices are ridiculously higher. read more