The first business location I had was in my garage, and I worked on "color televisions" among other things.

Those early remotes (volume up/down, channel up ONLY) had little hammers that banged different length rods, emitting a different audio frequency. The TV had a microphone that "listened", and the mic circuit had tuned coils that had to be tweaked to the right frequency for the right function. That activated motors for volume or channel change. Channel change was from 2 to 13, then back around to 2 again. If you missed channel 4, you had to go all the way around again, since it only went "channel up".

So at the same time I rode a Honda 500 with a disc brake on the front. With a little road grit in the disc pads, pushing the bike into the garage could cause a "squeak" as the pads and disc interacted. Once I pushed it at just the right speed, and a Zenith color TV started changing channels, again, and again, and again!

Anyone that old would know that sound, ka-thunk, ka-thunk, ka-thunk, ka-thunk...