I witnessed a rather surreal event the other day while out walking, someone who was clearly having a birthday party in their back garden (accidentally?) let loose some of those big "numbers balloons" used to mark the age of the person.
They floated up into the sky and tumbled over and over occasionally becoming readable, which looked weird, rather like some 60's sci-fi TV series. The numbers were a four and two zeros, I'm guessing that 400 wasn't the memorable date being celebrated but that there were perhaps two 40's leaving the poor organizer with a remaining solitary 4 with which to do something, could be worse I suppose. I did have visions of the numbers floating up into the path of some unsuspecting flight landing at Heathrow, I can just imagine the air traffic control conversation, worthy of a two Ronnie's sketch.