Didn't anyone else see the pictures a little while ago of passengers (lots of them) with the oxygen mask over their mouths only, rather than the nose & mouth. Two different incidents if I remember correctly. So much for 'we've seen this dozens of times & know what to do.' And if you think they can read the card or the signs & work out what to do, I've lost count of the number of passengers I have observed who couldn't figure out where the toilet is & have even seen a few who couldn't undo their seatbelt.