Here's a pet peeve I bet others out there share...
It is so exasperating when adults and older teens ride their bikes on the city sidewalks and expect walkers to clear out of their way. I mean, if it's a little kid on a bike, fine. I'd want my little kid to ride on the sidewalk for safety. But if you're an adult, or the size of an adult, you're old enough to be riding your bike on the road.
This was taken to new level last weekend, when we were walking from Nats Park to eat at Matchbox in Cap Hill. Our family of three was walking on the sidewalk, when we heard a cyclist approaching us from behind, demanding in a loud voice that we move out of the way. We did, stood for 20 seconds off to the side of the sidewalk as the cyclist approached and passed (the street was void of traffic by the way). The cyclist was met with a barrage of profanities from my wife after he passed (which, trust me, is never fun), but he just seemed to ignore it and keep going.