....on the floor, behind the dealers chair!
This was on Day One of the £500 at Luton, there were, incredibly, the

on the floor, face up, behind the dealers chair, between Tables 6 & 7.
Play on both tables was immediately stopped, the cards counted (BOTH Tables were using the same coloured deck), & play eventually resumed, but not before a fair bit of moaning & groaning from guys that had played AK & missed.
What an extraordinary thing! Assuming there was no skullduggery involved, a quite remarkable thing that it should be a pair of Kings, too.