Evil or not, you still need to budget.

So you’re an up-and-coming villain and you’re thinking of putting in one of those rooms where the walls close in and crush your hapless victims. Here’s two things you should seriously consider before making the investment. First, those things never work. Think of all the times you’ve seen them deployed. Now ask yourself, “ Has it ever happened that the smashy smashy room has killed the hero?” The answer is no; there’s always some last-minute glitch. And then, be honest, how often will you actually use it? And don’t say “all the time.” You said that about the hot tub.