Back when our office got their first IBM PC, the secretary used it. We found a DOS program that would throw up an error message: Warning: Water detected in drive A:! It would then display a message Pumping while causing the read heads to rapidly seek back and forth. Then it would say "Starting spin cycle." and proceed to just idly spin the floppy. It was hilarious to watch her first reaction. The program was called "Drain".
Yup!
We loaded that on a co-worker’s PC as a gag but for some reason it ran at too high of a speed to get the full effect.
I remember an old 1401 progrm that when running would cause a small transistor radio placed on top of the computer to play a ‘tune’ of the varying electrical pulses generated by the computer.
Only a computer running a single simple program could do that. If the program was run on a computer capable of doing more than one thing at a time, the effect was no longer possible.