This was told to me by my mother (say she's wrong and I'll kick yer ass), and I chose to believe it to this day as mother is never wrong. Yes mother, I'll just finish on my computer then I'll kill them - I'll kill them all for you mother!!!

Take for example the average television or computer monitor. It is happily doing its thing, when suddenly the smoke starts to escape out of it somewhere. Something that holds its precious smoke has ruptured and the smoke starts escaping, and the damn thing stops working. So when the smoke escapes, it doesn't work anymore.

The only exception to this rule is the toaster, which has an almost endless supply of smoke (obviously held in a pressurised canister by the amount that comes out of it at times), and some ovens - my one in particular.