I've posted this sighting of mine on one or two other boards in the past, including the sadly now defunct Space.com forum but to date nobody has been able to explain it.
Back in the early 1990s I was playing football (soccer) with my (then) seven year old son in our back garden. I happened to glance across to my neighbours' garden and saw a silvery-blue ball shaped object, approximately 20 ft away and 10 ft up, hovering above their garden. (I would say it was about the same size as the soccer ball we were playing with or maybe a little bigger.)
This object moved to my right towards the house, gradually gaining speed, then suddenly shot straight up in the air at tremendous speed and disappeared completely from view . I estimate, that from the moment I first saw it to the moment it disappeared from view was about 3 seconds and its speed when it shot up in the air must have been in the region of several hundred mph.
I shouted to my son about it to look up but he didn't see it as by then it had gone. I've never seen anything like it before or since and it took me completely by surprise. It spooked me out quite a bit at the time as well.
FYI: It was a summer's day and the weather was sunny with no thunderstorms around, which I would have thought would rule out ball lighting or some other weather phenomenon. I live in West London about two miles from Heathrow Airport.
Also, back in 2008 a video was posted on Youtube showing a sighting in Wales of an object that looks to me very similar to the one I saw, although this one is considerably further away from the observer than in my case. The object hovers just above the treeline on the far side of a road, and moves around slightly up and down and side to side for a while, then at about 0.33 (shortly after a yellow bus passes by) it too suddenly shoots upwards at great speed.
There is also a half-speed version of the above video:
I'd just like to add that the video was filmed through a car windscreen and when I posted the above videos at Space.com along with the description of my own sighting, somebody suggested it might be an insect or speck or dirt on the windscreen. However, specks of dirt don't shoot up in the air and out of sight suddenly.















