Oh I don't know. Quite a few of the aliens I've met have a wicked sense of humour. There's one groups that like cutting out the engines of cars on remote moors, then flashing lights at them from the sky. Scares the crap out of the driver.
I guess, it is a alien bug. Okay, there are also quite boring explainations like this one, but I prefer the alien theory /forums/images/graemlins/wink.gif
For myself, I just cannot go along with any unreasonable nonsense such as the alien theory. I am pretty sure that the Odessa group headquarters are in the vicinity, and this is a V weapon, being developed by the inheritors of Hitler.