But these cases are special these famous faces actually chose to bless regular people with their presence, and memorialize it with a photo.
Zach Braff looked positively ecstatic to be in the background of this romantic wedding shot.
The "Scrubs" star called it one of his best photobombs ever.
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Jimmy Fallon brought along two Chrises, Pratt and Hemsworth, to surprise football fans.
He also photobombed some tourists alongside Jon Hamm.
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Not even royals are immune to the photobomb bug did you spot Prince Harry in the background of this photo?
Amy Schumer was out for a run when she decided to take a break and join an engagement photo shoot.
We doubt the couple thought she ruined the shoot.
Jason Momoa channeled his inner Aquaman for this wedding shoot.
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How convenient that he just happened to be carrying his trident.
Dave Chappelle originally declined to join these engagement photos, but changed his mind and asked to "just photobomb one."
He told the photographer that "We're gonna go viral, man."
Adam Sandler bumped into a couple taking their wedding photos, and decided to come over and chat.
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The bride recognized him and called him over.
And in perhaps the most wholesome of photobombs, Tom Hanks came upon a couple in Central Park, and decided to hop in a few photos with them.
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Two tourists at Machu Picchu got to meet two members of One Direction, Liam Payne and Harry Styles.
It's not every day you see one of the Seven Wonders of the World, and two of the most famous boybanders on the planet.
Canadian prime minister Justin Trudeau got out of the way for a bride while he was surfing.
Yup, that's Trudeau rocking a wet-suit in Tofino, British Columbia.
Bill Murray is an accomplished photobomber and party crasher.
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This fan got more than he asked for when his picture with Sylvester Stallone was photobombed by none other than Arnold Schwarzenegger.
The two action movie icons are said to have had a "violent hatred" for each other in the '80s, but have clearly worked it out.
Bradley Cooper was visiting his alma mater, Georgetown University, when he happened upon a couple taking their wedding photos.
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Clearly, Bill Clinton was way happier to photobomb this little girl than she was to hear him speak.
Who among us hasn't gotten sick of waiting in line?
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