When I've captured my adversary and he says, "Look, before you kill me, will you at least tell me what this is all about?" I'll say, "No." and shoot him. No, on second thought I'll shoot him then say "No."
Pairing quite nicely with tips 4 and 6, which remind you that both shooting is not too good for your enemies and not to gloat over their predicaments, this also protects you from a common pitfall potential overlords fall into all too commonly.
The hero is not required to understand your plans, ambitions, or desires before they die. The longer you wait to kill the enemy, the more likely some lieutenant of yours will defect and attack you, or their sidekicks will bust in, or their animal companion will jump in your face, or they will find something to throw at you and then tackle you, or you will receive an urgent message that distracts you, or...
I could go on. Suffice to say, the sooner the hero is dead, the better things are for you. Minimizing risk to yourself is almost always a good thing.
Of course. You could never go wrong with conveyor belt and saw blade. :p
That actually relates to number 73, although it's not quite the same.
Basically, don't leave these things to chance. The conveyor belt could fail, the blade could break, the bonds might break, and so on.
The universe is rigged against evil overlords! Minimize luck, because almost all of it is bad luck for you. So you want to handle things with minimal luck involved, if at all possible.