The horrifying picture shows a woman's bare foot lying on the armrest of a passenger in front of her.
Airline passengers are used to all sorts of unusual behavior from their sometimes inconsiderate fellow travellers.
While there is nothing wrong with getting cosy mid-air, respecting personal boundaries in cramped, uncomfortable plane cabins is a must.
Social media users have expressed their horror after this couple were seen getting extremely comfortable in a very unusual position, the Daily Star reported .
A picture - shared to the passengershaming Instagram account - shows a man in a blue t-shirt and khaki trousers reclining in his seat.