My dad used to drive taxis for a short while and he once gave a man a free ride because the first thing he said upon getting in the taxi was "follow that car". My dad always wanted someone to say it to him and was overjoyed. Source
I got the story first hand a couple of days ago from the tuk tuk (rickshaw) driver himself who was asked to follow someone.
It all started when someone jumped into the guy's tuk tuk and asked him to follow another tuk tuk that was a few kilometers hundred meters ahead. The tuk tuk driver said that he followed the other tuk tuk without asking for an explanation and when the tailed tuk tuk stopped in a fairly secluded place he notice a middle-aged man step out with a child of 5 or 6. The passenger on our protagonist's tuk tuk then related the story of his following the other tuk tuk to him. The passenger, a good samaritan, was walking in a marketplace a few minutes earlier when he overheard a suspicious conversation that went on between the kid and the guy, involving the kid 'wanting to go to home' because 'you (the middle-aged man) wouldn't get me the bicycle'. The tuk tuk driver got off the rickshaw and headed for the guy, who left the boy alone to go for a piss. He then interrogated him with the good samaritan, and in the fashion of a true pedophile, the middle-aged man gave an incoherent account of his relationship with the boy and kept stumbling over his own words.
It later turned out that the middle-aged man lured the kid out of his hometown with the promise to buy him a bicycle and took him over to a different city all together to be secluded with him.
TL;DR: A tuk tuk driver and his passenger followed a pedophile with a young boy across the city and stopped him before he could do the deed. Source
I'm not a cab driver, but I did make this request once. My fraternity was doing an Amazing Race-type thing in Manhattan when I was in college and my team was neck and neck with another. We'd all finished a challenge simultaneously and the other guys stole a cab from us. Another pulled up and we rushed into it shouting, "Follow that cab!" The driver's reaction was, "No, no, no. Whatever this is, no. Get out." Source
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