Forgot one of the best ones: A large leisure centre/sports complex had 'ghost typing' occurring on several new Olivetti PCs. Root cause: Due to the size of th

Forgot one of the best ones: A large leisure centre/sports complex had 'ghost typing' occurring on several new Olivetti PCs. Root cause: Due to the size of the site, the staff had 5W walkie talkies to keep in touch. The new batch of Olivetti computers had cheapened keyboards, and instead of the electronics being encased in a metal clamshell, there was just a foil-backed piece of card folded over the PCB; this did not work as an effective rf screen and the walkie talkie signal strength was hitting the circuitry and causing random keypresses - including CTRL-P to keep dumping screen images to the dot matrix printers (this was DOS world late 1980s/early 1990s). Immediate fix: Replace new keyboards with earlier revisions. Longer-term fix: I seem to recall it was 'a few more capacitors' for rf decoupling.