Brendas Blog from Paraguay had a post up about "when Thank You means No"
It spoke of the tenacious street vendors that come up to your car window to sell you stuff.
We've got our fair share here in Ensenada too. Especially at the Tijuana boarder. So many in fact that if someone is seen approaching the car window you hear a chorus of the two voices from my 4 year old and 2 year old: