Feeding a troll, by engaging in such highly productive activities as responding to insults hurled bravely from the security of a distant computer, defending yourself against a personal attack from a complete stranger, holding heated debates with fanatics for weeks on end, taking part in edit wars, or engaging in any activity which may indicate to a troll that he has got your attention, may turn your experience in Wikipedia into a living hell, causing you to lose all interest in doing what you came here for in the first place, and wishing you never had opened a user account on this site.