Yes this^
I did this once... it worked very well.
(
epiphany coming live from Umeå, Wed 1 Jul 2009, 12:02,
archived)
I did once rub a magnet all over a tv screen while playing Manic Miner for a few hours.
The resulting colours were awesome!
The resulting broken tv, less so.
(
Prequal This is serious business. Very serious., Wed 1 Jul 2009, 12:18,
archived)