I must admit that I once ruined the monitor of one of my colleagues when I played the “look what cool effects this heavy magnet has on your monitor” game. And, no, the built-in degauss function was far from powerful enough to heal the permanent magnetic scars that I had caused.

If only I had known this page earlier, where they show a nice trick how to fix your magnet ruined monitor. Well, fix it fast before there are no tube monitors around anymore.