Lol... I see before also. 
What's next? Scan through their pants' pocket? 
I really don't know what goes through the heads of these
uncles....
They don't seem to realize how ridiculous they look when they
squat down to try to tap the machine with their chests.
I would also think that it takes less effort to just use two
fingers to take the card out of their shirt pocket and tap the card
against the machine.