They're places of study and academic research, but that doesn't mean libraries are devoid of a sense of humour. 

From warnings not to eat spaghetti or climb on sleeping students to pleas not to chew headphones, people have been sharing the funniest examples of library warning signs online.

One alarming missive from St Andrew's University warned users no to perform sex acts in the library toilets, saying that semen on the floor will lead to a rise in fees, although luckily it turned out to be a student prank. 

Another baffling instruction advised readers that they should step into the hallway if they wish to sob loudly, with accompanying image of a wolf to hammer the point home. 

Mama Mia! Whoever thought it was a good idea to tuck into a plate of Bolognese while reading library books got a short shrift 

Mama Mia! Whoever thought it was a good idea to tuck into a plate of Bolognese while reading library books got a short shrift 

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Share A bizarre notice warning students against performing sex acts in the toilets at the University of St Andrews turned out to be a convincing prank 

A bizarre notice warning students against performing sex acts in the toilets at the University of St Andrews turned out to be a convincing prank 

If you get to a sad bit in your book or the pressure of exam revising is too much, it's no excuse for breaking the silence 

If you get to a sad bit in your book or the pressure of exam revising is too much, it's no excuse for breaking the silence 

Fancy a snack? A reminder that headphone cords are not on the menu 

Fancy a snack? A reminder that headphone cords are not on the menu 

A startling reminder that avoiding the library can actually prove fatal 

A startling reminder that avoiding the library can actually prove fatal 

Be considerate! Apparently writing and clambering on people who fall asleep while revising is frowned upon 

Be considerate! Apparently writing and clambering on people who fall asleep while revising is frowned upon 

Pulling no punches! A terrifying fate appears to await anyone who dares to snack in this library 

Pulling no punches! A terrifying fate appears to await anyone who dares to snack in this library 

But what if you're reading Dracula? Some might argue that bat visitors could add to the ambiance 

But what if you're reading Dracula? Some might argue that bat visitors could add to the ambiance 

Baby got book! This library channeled Sir Mix-a-lot to tempt in new users 

Baby got book! This library channeled Sir Mix-a-lot to tempt in new users 

A lengthy conversation awaits inside if you fail to post your books in the return chute

A lengthy conversation awaits inside if you fail to post your books in the return chute

A hilariously passive aggressive sign warns against the perils of dropping snacks on the carpet 

A hilariously passive aggressive sign warns against the perils of dropping snacks on the carpet 

You never know who you might end up sitting next to if you fail to close the door, but sci-fi fans might approve!

You never know who you might end up sitting next to if you fail to close the door, but sci-fi fans might approve!

 

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