Gouranga

Now this has been irritating me for some considerable length of time. I have seen signs on bridges saying 'GOURANGA' for years, there is one in Durham, on somewhere around Nottingham and we passed another close to London the other week. I had to know what it was, but I have come to realise that if I post a 'today I am mostly wondering' people post answers I read them and then I forget. So this time I had a look for myself. Turns out it is a Hare Krishna saying that means 'be happy'. Which is nice, but brings about two issues for me.
Firstly, posting the message on bridges...doesn't personally make me happy, not at all in fact... it has mildly irritated me for a few years, until this time when I decided to resolve the problem, and frankly I'm still not what I would describe as 'happy' because of it.
Secondly, how did these signs get there?! Am I the only one who can't imagine the orange pyjama clan dance along with there tambourines and wallpaper paste to bridges all over Britain (well England at least), to spread happiness?! Not a great camouflage colour, orange, either is it?!