I started out like GRAYMAKER, making wooden knives. We used popsicle sticks, grinding them on the pavement. Later I made miniature bows and crossbows using large hairpins that I "borrowed" from my mother and sisters. Of course, I never let my parents find out about such activities. My wife has forbidden me from teaching such things to our sons. She did say it was OK to take them to visit local blacksmiths and knifemakers. She has her own collection of knives too, you see.
At about 8-10, my father got me started making model airplanes so I got a whole sucession of X-Acto knives, and the like. Getting some scars taught me to respect and use my knives properly.
About seven years ago, a friend in Vancouver asked me to check out a knife show in Toronto for him, since he was not able to attend. That made me aware of the artistic side of knifemaking. I found knifeforums, then BF. I gravitated to this forum since the atmosphere is so supportive and I had been making stuff ever since I was a kid.
I am now in the process of finishing my second knife. I do most of my work in the prototype shop at work during my lunch hour. That way, my hobby does not take away from my family time. The reactions from my co-workers have ranged from genuine interest "Cool, let me know how it turns out" to sheer ignorance "Are you going to kill someone with that?".
I have another similarity with GRAYMAKER - blowing stuff up

. We used to get firecrackers from our grandfather. He had connections in Chinatown. Now, I do it professionally, as part of my job as an electronics design engineer. I started with IC's (chips). As my career advanced, I got to blow up bigger and bigger things (AC motor drives and now UPS' up to 100kVA).
Phil