Reading this thread, a couple of things came to mind:
(1) "How clean is your aircraft?"
(2) I remember about 2 years ago getting a copy of a transcript and some photographs of the outcome of some cleaning staff pushing a few buttons in the cockpit - I understand that there was substantial damage done to the terminal...
(3) That capt and FO who were caught neckid on the flight deck - I wonder who got to sit on those seats next?
, and
(4) Quite seriously - one of my friends said that for the first year or so of flying long haul he had constant 'flu, but in the many years since then he's never sufferred from the usual winter bugs. He was quite sure that the crud in the cockpit combined with airconditioning did wonders for his immune system.