http://www.youtube.com/watch?v=z42fchrzhHY
It turns out that when the wheels of an A320 (probably all Airbus aircraft) touch the ground, and not all but 1 set, aileron control is cut by half. That is to say, it the stick has full deflection to left or right, the ailerons only move half way and therefore, being less effective. The reason for this revolutionary design? They say it's to prevent oscillation when landing.

It turns out that the reason this happened was because Airbus did NOT put any information about this in the A320 manual and therefore neither flight instructors or flight crews knew about it. Of cause it is in now, but the fraise involving a horse and bolt springs to mind. Makes you wonder what other information is missing from these manuals?
Anyway, the program was quite an eye opener and if you missing it, it's called Terror on the Sky on Channel 4 Sunday at 8 pm.