Re: "Cut the red wire..."
if _I_ had designed the thing, cutting ANY wire would detonate it.
I can think up many ways to defeat someone trying to disarm an explosive device by cutting a wire, like "cut any exposed wire, or remove any cover, and it goes BOOM". [real bomb disposal would probably just safely transport it in an armored container, then detonate it someplace away from people+things]
Good thing I'm not a terrorist, yeah - but it's the way white-hat hackers think - anticipate what is being done by thinking about how YOU would do it, muahahahaha!
/me thinking of 'Lethal Weapon 3' at the moment...
afterthought - I think the military deliberately detonates IEDs by use of claymore mines and/or C4