I never get these
I really wish I did, because the other day I found my Blaster (black box, with four choices of nois, loud noise, Death Ray is the best!!)
This it what I would do
Talk quietly so their hearing is nice and sensitive.
Wack them with the noise.
Imagine the shriek and jumping out of seat the other end.
ROFL.
Alas I never get these calls so I don't expect to get any satisfaction soon.