If you want to really suffer, go do the quests in Shimmering Flats. Gather scorpion poison, turtle scales, races parts and vulture bones.

The poison and scales are a low drop at best, especially the scales. The racer parts are all over the damn place but you need 30 each. The vulture bones are a 100% drop but there's like 10 vultures in the entire zone on a slow respawn.

I was nearly suicidal after that. Those quests would be hell even for a single player. It ranks right up there with Gnomeregan on the NEVER-GOING-BACK scale.