Someone tried to pickpocket me on the 132 on the weekend. He shuffled up next to me with a jacket over his arm and was reaching for the pocket of my board shorts (which had nothing valuable in it, and he wouldn't have been able to get it open without me noticing anyway as the velcro is super-strong). Anyway I am paranoid all the time, so I looked down and saw his hand. I stepped back and looked at him - didn't bother shouting because he hadn't actually touched my clothes yet and he would have just denied it. He pushed passed me to the back of the bus and made a fuss about getting on the wrong bus or something (as I continued to watch him) and got off at the very next stop - after he had just gotten on. I was pretty sure he had an accomplice with him as well, an elderly guy. The funny part was that he seemed genuinely annoyed that he'd just paid for a ticket, then had to get off again.
The frustrating thing is that you can never really do much about it - shout maybe, but there are never any police around when you need them, and everyone else just stands around and gawks, and a few old ladies tut tut a bit - I've seen it happen on the subway. Punch him? You don't know if he's got a gun or a knife, or how many people he is working with.
I've never been robbed here, but I do find it a little annoying that a lot of Argentines almost seem proud of the way the thieves rob people (foreigners especially). As in, when somebody tells them a story about a robbery, and they chuckle knowingly and say, "Yeah, those guys are really good." But when it happens to them it's all "negros de mierda, police this, Cristina that, Macri bla bla bla".
To conclude my rant, I also feel '9 reinas' is quite over-rated. It's a clever story, but the acting (apart from Darin) is pretty poor - and really it's a fairly typical heist movie. 'Secreto de sus ojos' is a much better movie overall.