Mobile phone escapes into the wild

Have you noticed how mobile phones with vibrating alert switched on can jump around?

I like to have vibrating alert switched on - as my hearing can be pretty duff in noisy surroundings - but I had a strange experience yesterday: while lunching at Kettner's, my phone escaped from the back pocket of my trousers, dropped to the velveteen seating, fell between two sections of benching and ended up under the the window. As I was crawling around under the bench, I almost expected to find a nest of phones gathering together.