I have heard reports of this supposedly happening in club race paddocks as well, and you know what?

I don't believe it.

Race bikes get a pretty hard life, nowhere more so than on the IoM. People are trying to tell me that they know, for absolute certain, that there's no way they could have got it wrong, or that an part could have vibrated loose. And on all these occasions never, not once, has any person been seen doing it. Really?

I'll have you know I'm the only person who has never cocked up an adjustment or failed to tighten something properly.