If you saw the film Live Free or Die Hard
you might have noticed the bad-guy hackers using flex keyboards in several scenes. Unfortunately, that doesn't really make a lot of sense. (Come to think of it, all of the portrayed 'hacking' scenes were so technically clueless that most of what went down in the film didn't make much sense either, but let's confine the discussion to keyboards for now.
Here's the problem with flex keyboards. You can't exactly touch type rapidly on one of these rubber 'bathmats'. (At least not any that I've ever used.) And the right software combined with raw typing speed
is essential to pull off several well known exploits.
Or at least so I've read. <Edit: fixed spelling. >