A little story that might make you smile from a few years back...
Two British traffic patrol officers from North Berwick had a bit of a surprise while checking for speeding motorists on the A1Great North Road.
One of the officers used a hand-held radar device to check the speed of a vehicle approaching over the crest of a hill, and was surprised when the speed was recorded at over 300 mph. Their radar gun then stopped working and the officers were not able to reset it.
Just then, a deafening roar over the treetops revealed that the radar had in fact locked on to a NATO Tornado fighter jet, which was engaged in a low-flying exercise over the Border district, approaching from the North Sea.
Back at police headquarters the chief constable fired off a typically self-righteous complaint to the RAF Liaison office.
...and back came the reply from the RAF:
'Thank you for your message, which allows us to complete the file on this incident. You may be interested to know that the tactical computer in the Tornado had detected the presence of, and subsequently locked onto, your hostile radar equipment and automatically sent a jamming signal back to it.
Furthermore, an air-to-ground missile aboard the fully-armed aircraft had also automatically locked onto your equipment.
Fortunately the pilot flying the Tornado recognized the situation for what it was, quickly responded to the missile systems alert status, and was able to override the automated defence system before the missile was launched and your hostile radar installation was destroyed.