Comment How times have changed. (Score 4, Interesting) 431
when I was about 12 in the mid 80's I rode my bike 10 miles to Radio Shack and bought all of the Mercury Switches they had (4?) for about $1.50 each. I built people detectors which consisted of a copper tube with batteries, Mercury switch, on/off push button, and siren. When we played hide and seek or paintball I could arm one and put a string across a path. If someone hit the string the siren would go off.
I lost one or so I thought. A kid found one and took it home. His Mom called the cops because she thought it was a bomb. The kid ratted me out as the builder. The cop showed up at my house and asked me to come look at something. I followed him and one of these devices was in the street. I told the cop what it was and he laughed and told me to pick it up and take it home.
I can't imagine what would happen today.