Grandparents, I think, are genetically programmed to fret about you. And the more information you give them, the more cause they have to worry. For instance, tell them you've had five accidents in a year while out riding your bike and they might begin to wonder if you should really be allowed out of the house at all without being wrapped in cotton wool. Don't tell them about the minor prangs, however, and they'll sleep safer in their beds.