A prank... [He can't help but laugh.] What an utterly detestable prank this would be. There had better be much more to it than that, otherwise I will be severely annoyed.

[At least he's getting an amusing conversation out of this?]

A wise decision for now. It's much better to gather as much evidence as you can before drawing a conclusion. It's a shame, though- I have this sinking suspicion that you would not be interested in assisting me with that.