When I was in Rome, a couple of youths tried the old trap-the-target-in-the-ticket-barriers trick on a friend of mine. Luckily another guy I was with realised what was happening, shouted "watched out" and the two guys scarpered after giving us a cheeky shrug.
I wish I knew about the brown goo trick before we went abroad — I would have been a lot more wary and alert. Thanks for the tip about the ticket barrier, I'll watch out for that as well.
