Popper said:I ALWAYS know where I am going and how to get there in a cab. I'm not afraid to ask where they are going the second they make a wrong turn. The only time I've been on a gringo ride the guy clearly didn't know where he was going and was sorry - took a wrong turn over a bridge...I offered to pay him what it normally cost for the same ride and he was fine with it. I've also never gotten in a cab expecting to change a 100 peso bill and the only time I've gotten in with a 50 I've asked up front if they have change. Protect yourself by knowing the city...look it up the route on google maps beforehand if you're unsure.
Kind of my point before. Wouldn't it be nice to just be able to jump into a cab without having to prep first? And to just be able to sit there without watching like a hawk to see if the driver is up to no good, especially if you're tired, drunk, talking, whatever? I think people get frustrated having to always be on guard.