In message , zaax
writes
You could try the 'Mosquito' which is a sound at 17KHZ. It's a high
pitch tone (high frequency tone) that adults can't hear, and kids hate.

Oy, don't you be encouraging that sort of thing, it's not all adults
that can't hear it.

---
zaax
Frustration casues accidents: allow faster traffic to overtake.

--
Clint Sharp