It's rude to show pubic hair in public.
Joseph is an adult and is at the public swimming pool where children are present.
Joseph wants to get out of the water.
Joseph keeps his swimming trunks tied tight, and they stay on his waist as he gets out of the pool.
Joseph lets the weight of the water pull his trunks down to his pubic region and does not pull them back up.
All the people at the pool, including Joseph, enjoy their day.
Parents at the pool are outraged and call the police on Joseph.