My first (and only, so far) diet was in order to GAIN weight. I had to eat myself into the Navy, to go from my baseline of 98 lbs to the required minimum of 115 lbs. I was able to get up to about 118. After boot camp, I weighed 98 lbs again.
My first bicycle was a rickety thing with no nameplate that one of the neighbors let me have. It was way too tall for me and pretty rusty, but it was MINE.
My first motorized contraption for tempting death was a 3-1/2 hp trycicle. The front was a cut-down fork from a bicycle with a min-bike wheel attached. The sides were two pieces of angle iron. The back was a piece of 2 x 10. The engine was attached to the board, next to the driver. This contraption would move along pretty well, but it had no brakes, so getting it over 25 mph was ill-advised but a daily occurence (until the clutch burned up). I was working on this thing trying to get it started, when it DID start unexpectedly, went to full throttle, took off without me, and ran over my neighbor's newest acquisition, a young and rare tree. As I recall I had to make restitution of some sort.