Corrupt Qeynos Guards -- Qeynos is SonyEQ spelled backwards. And, depending on your race / class, it didn't even take that much to make them hate you.

Killing the corrupt guards, often one at a guard tower in the Plains of Karanas west of town, and turning in their bracelets to a non-corrupt guard at the bridge to South Karanas, was great XP for quite a few levels in the midgame. And it is possible to repair the corrupt guard XP (slowly) with low-level quests.