I've not seen many sun halos in the UK but I saw quite a few when I was in Florida a couple of years ago. You definately seem to get it worse in the USA than we do in the UK.

It's definately a sign of something. Either Jesus is coming or we're being slowly killed off by the shit they are spraying that causes a halo to form around the sun.

Considering that Jesus' return is supposed to coincide with the end of days I'm not sure which option I prefer right now ;-)