Usually known as Chinese Water Torture, but actually Russians applied it too, as early as 400 A.D. at least, so let's get more specific:

By the way, that's the reason why an anime with a really silly or strange concept can turn out to be a masterpiece. Girls driving tanks? You're kidding, right?

My first reaction was, "all right, jeez, I'll give it a try". The second was, "at least he moved on from Mouretsu".

The problem with this, we've been to this tango before, and more than once. Railgun was the most traumatic case. It was the only anime that made me consider ways to kill main characters (eventually I decided that the best course of action is poison — you can't teleport out of it).