''I have accidentally disconnected the autopilot in a 330 with my knee, why did that not make the news?''
It's very easy to accidently disconnect the AP on the FBW Airbus types. The disconnect/takeover button on the sidestick is neccessarily very accessible and consequently in a vulnerable position. It happened to me recently when the clipboard slid off the other pilot's table in turbulence.
As far as I'm concerned, it's a very minor incident and when it happens, you just re-engage the AP - assuming you know how to! And that is why you don't allow unqualifed people to occupy the pilot's seats in flight. In our operation, we have to have a cabin crew on the flight deck if one pilot has to use the toilet and they sit on one of the jump seats.