There was a blizzard in Boston yesterday and cabs were impossible to find. A friend of mine was trying to get across town to meet me and a few others at a bar, but he couldn’t find a cab. So he walked down the street to a pizza place and ordered a pizza for delivery to the address of the bar. When the pizza was ready, he asked the driver if for a 50% tip, the driver would let him ride with him to where the pizza was going. The driver said no problem and everyone made out happy; even me, who got some pizza out of the deal…