Jews used to keep an 'emergency ham' during the inquisition and other times.
Because the priests were doing exactly what we are laughing about.
They would go door to door, especially on Passover, to make sure Jews were not observing Judaism.
(which they did anyway, btw)
So Jews would keep an emergency ham hidden somewhere so when the Catholics showed up
they could hurriedly slap it down in the middle of the table as if they were eating it.
*BANG BANG BANG* door
'Why have you disturbed our meal!?'
takes a look around...
'Sorry sir, we thought you were Jewish.'
I guess now in the era of the New Democrat Fascist Party enforcing the 'mask inquisition', everyone will have to keep emergency masks nearby to slap on when they hear there are 'raids' going on in the neighborhood during Thanksgiving, Christmas, and Easter.