Slice HD: you will hurt your fingers on your iPad

edit: bought it, great fun. the touch interaction works the way you need it to (ie. more advanced than most touch apps) so you can come up with lots of different techniques to beat the levels. when you get cut it does cause a slight 'aaaahh!' reaction and withdrawal of fingers. you get kicked back a level if you get cut, but hey, no pain no game.

Here's a popular story of the "hand" study: http://www.postgazette.com/healthscience/19980219bhand1.asp

Here's the paper: http://www.pni.princeton.edu/ncc/publications/1998/Botvinick...