Those damn kids....

[Dr Dave]

Water pistols - and a water soluble paint? 

[steve_holmes_11]

[mmcv]

A fair number of them lack goolies! But I can agree with the general thrust of the argument.

[d_Guy]

A fair number of them lack goolies! ...

Oh brave new world that has such people in it.

[FierceKitty]

Buy a mantrap, give a public demonstration of what it can do, and let it be known that you'll be putting in out to catch troublesome bratlings. It would be illegal to do so in reality, but let them suspect that it's there. You could also hire an accomplice and stage an accident in which he or she lies screaming with a Versailles-level spray of fake blood pulsing into the air....

Deterrence is ze art of producing in ze mind of ze enemy...ze FEAR to attack....  (Dr Strangelove)

[mmcv]

Buy a mantrap, give a public demonstration of what it can do, and let it be known that you'll be putting in out to catch troublesome bratlings. It would be illegal to do so in reality, but let them suspect that it's there. You could also hire an accomplice and stage an accident in which he or she lies screaming with a Versailles-level spray of fake blood pulsing into the air....

Deterence is ze art of producing in ze mind of ze enemy...ze FEAR to attack....  (Dr Strangelove)

Https://youtu.be/IJw2lFWJ4aY

[steve_holmes_11]

Recommend studying tactics employed against horse archers.

Elephants, Camels, Flaming Pigs, Greek Fire.
Or perhaps plashed wood edges (whatever that are).

For those who've ventured beyond the 3000BC - 1500AD era, there's a device that emits a sound that irritates youngsters, but us grown ups can't hear it.
Cant remember the name, something like "Radio 3".

[Ithoriel]

Mosquito

https://en.wikipedia.org/wiki/The_Mosquito

[mmcv]

Mosquito

https://en.wikipedia.org/wiki/The_Mosquito

Haha, very tempting but would likely drive the dog nuts! And the neighbor's baby!

Elephants, Camels, Flaming Pigs, Greek Fire.
Or perhaps plashed wood edges (whatever that are).

For those who've ventured beyond the 3000BC - 1500AD era, there's a device that emits a sound that irritates youngsters, but us grown ups can't hear it.
Cant remember the name, something like "Radio 3".

Not sure we'd fit an elephant in our house, but flaming pigs seems like a sound plan. Can't see any drawbacks or potential issues, plus you've a tasty meal afterwards.