I wouldn't use one myself and there are questions you most absolutely, most definitely should not ask it, like "when will I die", as it appears that people who ask this question meet an untimely death.
I want to know if this works on your enemies though . "When will the terrorists all die?" ?
I did recently search through people's experiences, and some are quite intriguing .
You'd be fun to summon . "I bet you can't eat all those chili dogs".
What would you ask it ??