Most annoying Jump Quest?

I'd say the hardest one would have to be the very last ellinia jump quest or the very last John's Present jump quest in sleepywood.

Why are so many people saying zak JQ is hard? It's the easiest one to me.

Because it's horizontal, so if you fall there's no chance that you won't have to start over. Not to mention you have to walk all the way back to the front through Lava to get there. I died more than one time because I wasted all my potions and fell into lava. Then you toss in Poison, self-destructing monsters, and the fireball shooting statues paired up and you've got a festival of frustration. Trying to time that last jump in this was such a nightmare...

With the sleepywood or ellinia jump quests, if you fall you at least have some hope that you could land on a platform below you, and not have to start over from scratch. The obstacles also tend to move slower though that's not true for all of them.