The couple were looking to calm their nerves after a session inside the station, police told Phuketwan and were only arrested after being given a warning.
The incident came about as the climax to a domestic Patong squabble.
The South African man's wife - Khun A - shared an apartment with Khun B, who was married to a well-off Malaysian man.
They split the rent of 8000 baht but recently, when Khun A was asked to pay her share, she was unable to do so.
As a result, according to Patong police, Khun B threatened: ''I'll throw all your stuff away.'' And when Khun A still declined to pay, that's what she did.
Khun A went to Patong police and told them that she wanted Khun B to pay her 400,000 baht, the value of her possessions.
Patong police checked the list and put a value on Khun A's possessions that was nowhere near 400,000 baht.
It was while continuing the claim that Khun A and her husband decided to step outside and relieve the stress with a beer in the ground of the police station.
On top of the 7500 baht fine, Khun A has a second problem, having tested positive for ya bah methamphetamine.