So far, I've found two amusing uses of Conjure Spirit.
1) Interrogating dead witnesses. For example, a murder mystery in Caladon. Who knew you can interrogate victims?
2) Taunting the dead. For example, whereas interrogation didn't prove incredibly useful (perhaps partially because of bugs?) in the murder mystery in Qintarra, it's sure fun to make fun of him to his spiritual face after the mystery is solved!

Anybody else know of fun uses for this spell? Spoilers may need tagged. I don't mind hearing specifics, but I tried not to spoil anything in the first post.

Yeah I know what you mean.

When looking for Qintarra I killed a certain person in Stillwater for being annoying then I started walking away. Then I thought of that spell so I went back. Tried it and got the location. Was slightly suprised and rather happy that it worked :D

Also, on occasion, I too taunted the dead :P