[Tsuna hasn't put much thought into it either. He has an idea, but he's not confident in the success of his plan.]

M-maybe if we take his guitar away? We can make it seem like an accident by knocking it out of his hand and making it break.

[That sounds a bit horrible. He doesn't really want to break other people's possessions.] O-Or maybe we can try and scare him? Make him believe this area is haunted?