Now I'm no way suggesting that I had anything to do with this but a friend of mine, a few years ago had a party in his garden in North London and had a 2w laser borrowed from a famous nightclub set up outside.
Bored a midnight, he apparently, (I was not there)
shone it at a few aircraft flying over.
Within the hour there was a police helicopter circling and the laser was on its way back from whence it came, sharpish.
Meant no harm and didn't realise that it was that bad, but it was a good strong laser. Apparently......