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Confronting people can be intimidating for some, and so their preferred method of communication is via a note.
These signs, which were spotted around the world and collated into a gallery by Bored Panda, show how petty people can be when they are not in a face-to-face conversation.
In an effort to get their point across, many of the people who wrote these signs used sarcasm.
Among the signs, is one outside a lone shop which has shut down operations. After letting people know they are closed for business, the sign writers added 'thanks to everyone'.
Another of the images shows how far one aggrieved motorist went after seeing some poor parking, actually getting chalk to draw lines on the floor to mark out where the vehicle had been placed between the allotted places, and writing: 'Parking spot just for you.'
This hand drawn sign, thought to be in North America, shows how far some people will go to make a point, getting two different colours of chalk to create their message
To add an extra edge of sarcasm, the angry sign writer finished their etchings with three hearts.
Meanwhile, another of the photos shows a sign explaining that some toilets are now no longer available for use due to vandalism. As a finishing touch, the note says: 'This is why we can't have nice things.
Here, FEMAIL shares hilarious passive aggressive signs that show just how petty people can be...
Spotted outside a now-closed shop, thought to be in North America, this sign is perhaps more passive-aggressive than the writer intended
Whoever wrote this sign seemed annoyed about having to close these bathrooms, and couldn't resist adding a final flourish to the note, lamenting that 'this is why we can't have nice things'
The original sign, thought to be from the UK, may not be passive aggressive, but the addendums created by 'Carolyn' certainly are
Whoever wrote this sign, believed to have spotted in the UK, may have had to clean up a lot of dirty toilet paper - and is not happy about it
The writer of this sign, which is thought to have been spotted in Hawaii, went with classic sarcasm, suggesting that a number of people have, in fact, used this potted plant as an ashtray
IT'S FINE: This clever sign uses passive aggression to make a joke about passive aggressive club
Whoever designed this message may not have intended to come across as so passive aggressive, but the words 'we hope you're happy' certainly read as sarcasm
While this sign left on someone's car window opens with 'thank you', the rest of the note shows that the writer was actually being sarcastic
This sign, thought to be from North America, shows how petty people get when others don't pull their weight with domestic chores
While this sign may not be particularly passive aggressive, the three huge red arrows certainly are
The owner of this Porsche, who apparently parked in the wrong place was the recipient of an extremely pointed message