But, unfortunately for the people of Moscow, it actually happened.
And led many to duck for cover as the hellish blue loos made a bee-line for them.
Footage of the rampaging portable loos show people scrambling away from the terrifying blue boxes as heavy rainfall hit the city centre on Monday.
Bryan MacDonald, a journalist, shared the video on Twitter, with the caption ‘this is not a joke’.
But many users couldn’t resist laughing at the whole situation.
Matt Veasey wrote: ‘Headed to Red Square today? Urine for a big surprise, it seems.’
One user was particularly concerned though, writing: ‘I would run too… killed by a porta potty as cause of death would look silly on my gravestone.’
Storms hit Moscow earlier this week leading to emergency services issuing an official warning for residents to take over, but this way removed the next day.