If you never saw the South Park "Make Love Not Warcraft" episode, you should, it's pretty funny.
Kyle and friends cannot advance in WoW because another player on the PvP server keeps killing them before they can complete their quests. It's a circular problem, they can't kill the other player without first reaching a high level, but as long as they can't kill him, he prevents them from reaching a high level.
Their strategy is to grind for months, killing wild pigs for 2 xp each 
This is just the first part of the episode:
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