Don't really want to hurt them but you ain't above petty pranks.
Well, I'm a bone fide prank hater so the companion of my keep that specialize or enjoy pranks or being petty are just itching to go out and have some fun.
The only caveat is that you have to be comfortable not knowing about their frustrations.
On the other hand, if you have contact with the person, you may have the privilege of hearing them whine about their grievancances.
No guarantee, though, and thus it is priced accordingly.