It's an upmarket emporium's worst nightmare.

A Burford Garden Centre customer has been spicing up their rustic chic home interiors section by rearranging the alphabet mugs into rude words.

A shopper has spelled out words such as “bum”, “poo” and “sex” using the decorated cups.

William Whyte, an Oxford University professor, snapped the evidence and shared it on Twitter.

Amused social media users commented “you did that, didn't you” and “you have been very busy”.

However, the naughty words could have been a lot worse.

In the past Homebase has gone as far as banning bored customers from rearranging their alphabet candles into rude words.

In fact rearranging lettered shop items has become a bit of a craze.

The prank has been dubbed 'Supermarket Scrabble' and sees users share their most hilarious phrases on Facebook.