A friend told me about this some years ago.
She was trying to sleep one night and kept hearing music. She realised that her newly moved-in elderly neighbours, who had just returned from a weekend away, had left the radio playing in their caravan now parked directly beneath the bedroom windows of both houses.
As she had to rise early for work the next day, my friend realised she had no choice but to go round to the house next door and let them know.
She was mindful that knocking on someone's door in the early hours of the morning could be quite alarming and she wished to get her point across as tactfully and politely as possible to these new neighbours.
She knocked assertively but not aggressively and sure enough, lights were switched on and two anxious dressing gowned figures opened the door.
'Sssh' said my friend, holding a finger to her lips, 'Listen'.
It was at that point that rather unfortunately my friend let rip a rather loud and long fart.
No further words were spoken. My friend turned on her slippered heel and returned to her home.
She put the house on the market the next day.