Tools last ditch effort to get attention.
Interesting discussion highlights the lack of training in how to get the PF's attention after all the usual attempts. A suggestion I have passed on is to place your palm two inches in front of the PF's face/eyes with a loud "look at me look at me" then when the PF reacts by pushing your hand away or looking at you say "you must go around." or whatever.
No actual physical interference with the PF or the controls.
If he cant see he cant fly but you WILL get his or her attention.
if it does not and the aircraft is in danger save yourself any way you can you have a big problem sitting next to you.
Works with kids too.