Two South of Market residents were awoken Friday night to find a stranger showering in their bathroom, according to San Francisco police.
The prowler was discovered sometime in the early morning inside a residence in the 300 block of Harrison Street.
A 45-year old woman and 35-year-old man were sleeping when they noticed the shower was running.
Upon entering the bathroom, they discovered an 18-year-old man showering. The pair called security who called the police.
The uninvited shower guest was arrested.