The art of 'photobombing' has soared among the young in recent years thanks to ever-present cameras and the ease of posting pictures online.
But such moments can also take place completely by chance and are, arguably, all the better for it.
Ouch! As a tourist poses for a holiday snap in Berlin, a cyclist slams into a lamppost
Girls just wanna have fun! But as these five friends pose for a light-hearted picture, their pet dogs engage in some rather more frisky behaviour
Not impressed: A snarling man glares at the camera as four girls on a night out pose together
Creepy: As these schoolgirls make 'V For Victory' signs, a man stands in the background with his trousers around his ankles
So while some feature strangers pulling unexpected faces in the background, in one case a cyclist is caught mid-accident.
The exact moment the unfortunate rider falls off his bicycle is caught on camera as a tourist poses in front of a Berlin landmark.
Or take the five friends posing by a swimming pool in the top photo.
What was originally intended as a fun picture at the height of summer is turned into something rather more frisky by their pets.
Here's looking at you: Even something as seemingly innocuous as a television can cause much mirth
No privacy: A dog answers the call of nature while his owner strikers a voluptuous pose for the camera
Original photobomber? A cheeky boy at the window offsets the sober nature of his picture
Ladies' man: While actor Wilmer Valderrama cuddles up to two attractive females, a man in the background ruins their photo
Boobed: A topless woman strolls by right at the moment a bride and groom exchange their vows
Say cheese! A proud mother takes a photo of herself and her not-so-well-behaved son
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