I once hailed a cab at LaGuardia for a trip into Manhattan. The cabbie was quite the conversationalist, and offered to be my personal chauffeur for a full five-day trip, so that I would not rent a car after I was in the city or fly back to Ohio at the end of the week.
He was willing to drive me into the city for Monday & Tuesday, then out to Long Island for Wednesday & Thursday, and finally back to Ohio, for full fare, of course. It was very funny, though it took me about five minutes before I realized this guy was seriously trying to sell me on this.
After that experience, I stopped hailing cabs and stored a number for a Limo/Town Car service on my cell.