There is an AWFUL lot of bull sheeeet being thrown about here guys!! The best, truest and nicest answer is that the fairies were the ones what dun it!! And very nice little folk they are too, so DONT GET THEM ANGRY OR THEY WILL TAKE THEIR "LIFT" AWAY - SELECTIVELY, which means that when you are gliding in, quite nicely placed, towards the finish line and you think that you have a top place all wrapped up, it is then that the "lift fairies" will strike!!! And instead of having a favourable wind to cross the finish line with, you will be suddenly "lifted" almost straight up and thrown aback as you watch several other "believers in the powers of fairies" cross in front of you. So take care, you have been warned. (I have seen it happen many times – and that’s the truth -)