A mysterious person known as the ‘Piss Bandit’ has been causing a stir in Pasadena, California, for the past six years.

The person comes out at night donned with a mask and latex gloves, regularly leaving bottles of urine in an influential neighbourhood, carefully arranging them on a utility box before vanishing into the night, as reported by New York Post.

The bottles, which include soda bottles, juice cartons, and gallon jugs are filled with yellow liquid, and are accompanied by crude drawings and notes like ‘human urine’ and ‘HIV positive.’

The bandit sometimes strikes multiple times a week, leaving behind fresh bottles each morning that disappear by nightfall.

The city attempted to stop the bandit by adding a pointed metal cover to the utility box, but the Piss Bandit simply removed it and continued his antics.

"It’s been a tug-o-war between the neighborhood and this guy," said Grant Yansura, who, along with filmmaker Derek Milton, launched an investigation into the mysterious figure.

Their TikTok videos about the case have garnered over 600,000 views.

While Yansura and Milton see the bandit as a vigilante artist akin to Robin Hood, many neighbours view him as a nuisance.

One local expressed disgust, stating he never considered the act an art form. Another neighbour threatened the bandit, saying, “If I catch you leaving your piss here, I will make you drink every last drop!”

Despite the attention, the bandit remains elusive. He ignored the duo's attempts to communicate, even stealing their cameras. Ultimately, Yansura concluded, “Sometimes you just have to let an artist pee.”