Lana is partially used to it by now: we're walking down the street, talking, and she turns to say something, and there's no David.  He's back at the beginning of the block staring at an unusual deraileur, frame, crank, or logo on a bicycle.  In Japan, she had to explain to a tour guide that David was taking a picture of a bike.  "Why?" he asked, genuinely puzzled.  David's gotten odd looks for taking pictures of a lot of obscure things, but taking pictures of bikes generally get the most confused glances from passersby.  It's also one of the few things that David's never caught another photographer surreptitiously sizing up for a me-too photo.  If you're in the "Why?" camp, this may not be the post for you.  However, if you know anything about Japan or bikes, David has some burning questions about some of the peculiarities he observed in Japanese bikes.