A Canadian snowboarder has tweeted a picture of toilet rules which he claims are displayed in the loos for athletes in Sochi ahead of the Winter Olympics.

If Sebastien Toutant’s photo is genuine, sportsmen and women are expected to sit down when going to the toilet. They must also avoid being sick and are not allowed to urinate while standing up or squatting.

But more bizarrely, there appears to be a ban on fishing in the toilet pan and another abstract ‘don’t’ in the bottom right-hand corner of the sign. Is that a syringe?

The 21-year-old, also known as @SebToots, shared this picture with nearly 18,000 Twitter followers after arriving in Sochi, Russia, for the Winter Olympics, which are due to start on Friday.

“Well that's interesting... Sochi rules in the bathrooms!! #haha #olympics,” he tweeted.

“What on earth is the last one?” replied Vivere Baker.

Another follower suggested the last picture meant ‘no alcohol intoxication’.

Luckily for Sochi bosses, fishing is not an Olympic sport.

This is not the first time Sochi’s loos have caused some toilet humour.

Side-by-side toilets at Sochi Winter Olympics

Side-by-side toilets in a single bathroom caused a social media sensation last month when they were discovered at the biathlon course of the Sochi Olympics, swiftly becoming a national joke in Russia.

The Sochi organising committee initially denied knowledge of the second twin toilet, and it has not been able to say whether the loo-loo was built by design or resulted from an error during the plumbing process.

Photo credit: Twitter/Sebastien Toutant