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The middle-aged man, described as "well-to-do", walked calmly into the branch in Andover, Hants, and started leaving non-monetary deposits on the floor from the bottom og his shorts in front of horrified customers.

One eyewitness said the man looked "calm but angry" as he made his mess in the bank.

He apparently even walked up and down the stairs in a deliberate attempt to make as much mess as possible.

Garreth (Corr) McCarthy, 27, revealed: "I was just queuing up, there were about a dozen customers there, and this guy walked in.

"He looked pretty well to do. He was a middle-aged man, in his 40s, wearing shorts and trainers, and he had a bald head.

"He didn't say anything at all, but you can tell from his face he looked angry.

"I wasn't really paying attention until I noticed a foul, but unmistakable smell.

"I looked at the guy and he was just calmly walking around the bank – going to all the areas he could.

"It's quite clear what he was doing – he just had this calm but angry look on his face, as he walked around leaving special deposits on the floor.

"And then as calmly as he walked in he left.

"Staff didn't know what on earth had just happened.

"The stench was unreal."

Staff cleared out the bank while tey put up signs and they were forced to get on their hands and knees and clean up the disgusting-smelling mess by themselves.

Gareth added that the man "looked smug" as he walked out.

Barclays would not comment on the incident.