Ok.... how?

Phil noticed last night that Michael had something like a splinter in the heel of right his foot but Michael wouldn't stay still enough for him to get a good look. We got the doctor to remove it today since it wasn't easily removable by us and it turned out to be... part of an eyelash?!? And not a human eyelash - a cat eyelash by the look of it. How on earth did Michael get a centimetre-long piece of eyelash lodged sideways in his heel? It boggles the mind...