I once had a taxi driver try to drive off after seeing my mum in a wheelchair. I walked in front of the taxi to take a photo of the license plate and then he suddenly changed his tune saying that he didn't see the wheelchair! (It was raining quite heavily to be fair.)
This was a $30 fare to the hospital (but he didn't know where we were going until we got in) and he had just delivered someone home, so he would have had to drive empty for some time out of our estate to find another fare.