See, for example, Tetris on a ('secure hardware' platform) chip & pin machine[1]

The same group (security research at cambridge) are also the ones who produced the 'chip and pin is a joke'[2] paper you might be referring to.

[1] http://www.lightbluetouchpaper.org/2006/12/24/chip-pin-termi...

[2] http://www.lightbluetouchpaper.org/2010/02/11/chip-and-pin-i...