> You know those real mechanical relays we used to build computers of some years ago

Or found in just about every home appliance where mains voltage is switched by a CPU.

I've got an electrical garage door opener, came with the house. We've been here 16 years and the relay has always been sticky: I have to bash the unit with a broom for it to work. One day I'll replace that damn relay.

Same, having worked on firmware that controlled relays (and NAND chips) and managed to burn them both out surprisingly quickly due to software bugs :p