First, in Rock Creek Park, a bicyclist towing a trailer with a boom box on it, one the size of a small suitcase. I suppose he must have been going to meet friends, else why not bring an MP3 player with earphones and lose the weight? I didn't care for the music, but when I'm running I prefer cyclists I can see coming, and he was hard to miss.
Second, on 16th St. NW, a Google Street View car. I spotted the superstructure first, a dodecahedron(?) on a tripod mast, then the car with its identification. One of these days I'll go to Street View to see whether it shows a glum fellow in sunglasses oppose 16th & Arkansas.