Mine is bicycling. To me, a bicycle is a device built to convey me a short distance before humiliating and injuring me. I am comically bad at it, capable of flinging myself into unseen ditches and then having the bicycle land on top of me in a painful manner. Since childhood, I essentially look like one of those self-evolved neural net programs trying to propagate some kind of "vehicle" of randomly distributed wheels across a terrain: flailing, flipping upside down at the tiniest bump, hopelessly mal-adapted for the task.