_electronics_ are hard. I always remember back to one of my electrical engineering labs... The oscilloscopes were sensitive enough that someone walking past the

_electronics_ are hard. I always remember back to one of my electrical engineering labs... The oscilloscopes were sensitive enough that someone walking past them was visible on the scope. Really, any motion near it. It was especially funny when we were trying to figure out why a particular experiment wasn't working (we couldn't pick up any signal from our circuit at all), yet we could pick up noise from movement around the scope. Turns out the scope had a faulty BNC connector... It was very frustrating at the time, but many humorous memories in the decades since.