Reminds me of a story too...
My Dad had a new-ish 386 PC which he loved, he especially loved how fast it was. One weekend I played some games on it, one of which (maybe Level 42?) needed the turbo off, as it was way too fast to play at the full nosebleed-speed of 33 MHz. I then went away for the week.
When I came back that Saturday lunchtime, he was literally waiting on the driveway for em, purple with fury. He'd been struggling for the whole week with an unuseably slow PC, and he'd tried rebooting, and he'd tried lots of things, and it had ruined his week... basically he was ready to murder me, and woe betide me if I didn't fix it pronto.
I was in a panic - what the hell had broken to make it so slow? Was it something I'd got from a BBS with a virus? Was it some TSR causing an issue?
The panic ended when I walked into his study, and from across the room saw the Turbo light off. I walked over to it, pressed Turbo, and let him try again. Problem solved. It was years before he could laugh about it...
That reminds me, I shoudl dig out Level 42 and try it on my 3.4 GHz machine... maybe running it in DOS in Bochs would slow it down enough?