Acute Humiliation At Altitude.
There you are in a plane, watching a film like 'Blue is the Warmest Colour' when scenes of two 'people getting along famously' (© Stuart Maconie) are shown on your tablet/device. If you are overlooked by other passengers or cabin crew this can easily result in a case of AHAA.
Care also needs to be taken if the film is of a more disturbing nature such as 'Let the Right One In' or (cue Yorkshire accent) 'Mother!' particularly if you are squeamish. It can be awkward having a fellow passenger lean over and gruffly, but kindly, suggest you read a book instead.
Mark suggests that any film over a 12 certificate should be viewed at home rather than in public.