Remember those stupid mines on Balmorra? One of the first side quests there "Step Lightly". You have to deactivate the mine to make the core pop out and then you get attacked so you can't click the core until you dispatch the enemies. The problem with this is that while you're fighting, anyone with that quest can come and pick up the core. So you have to wait for the mine to respawn and then do it again, hoping another person doesn't come along and steal that core too. Had 2 people in a row do that to me once. Very poorly designed, should at least tap the core so no one but the person who deactivated the mine can pick up the core.