How to damage or remove the grub? :)

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http://www.linuxforums.org – I have dual-boot XP and Karmic. I want to practice restoring the grub, before any emergency occurs :) I plan to use the following thread: Grub/XP/Vista Bootloader - Ubuntu Forums I would be grateful if someone could tell me an easy way to damage the grub. For example, re-installing XP always damages the grub, but I'm sure there are quicker ways to do the same thing :) . (HowTos)