Judging from current experience, whenever I’ve built a huge unstoppable war machine and managed to delay the Hero so that he arrives just late enough not to be able to stop me from making the required Tedious Speech about ruling the world, laughing maniacally, then throwing the Big Red Switch, it’ll go:
and then I’ll say “oh, f’kinell, I’ve connected the power supply the wrong way around yet again, haven’t I? Hang on, be five minutes”. And the Hero will have a cup of tea, and I’ll have to pfaff about with said huge unstoppable war machine, plug things in again, check them this time, repeat the Tedious Speech, laugh maniacally, throw the Big Red Switch once again, it’ll go:
And there’ll be this nasty burning smell, a couple of little red lights will go on, and I’ll say “err… dunno what that was but it’s not good… this could take a while…”
And the Hero will just toddle off home, safe in the knowledge that humanity is spared, as usual.