Boredom is a probably the worst thing in hell.
Think about it.
Everyday, you get the same torture. Everyday it is the same. Everyday it doesn’t change and each day just keeps piling on. Eventually you get to the point when you just don’t care that some yawning demon (just as bored as you) is constantly shoving rusty spikes into various extremities. One day you find yourself wishing that you could get the chance to experience the torture of your neighbor (who is having his lower intestine eaten by a crow-headed dog).