Airbus Drivers,
Next time you go for a sim check, just ask your check air man to freeze all of your pitots during a climb (lets say passing 30.000'). Everything functioning normally, with AP ON...
Since pitots were frozen at the same time (no significant speed differences between ADR's), your ECAM will stay silent until high speed protection actuates and takes your aircraft into a deep stall...
You will have to force your aircraft status to change to Alternate Law, in order to be able to push your nose down...
That experience will tell you a lot about the aircraft you're flying...