I can actually see how someone would think of that plastic urinal can in the bushes. Having lived in Germany for 2 years, and visited throughout Europe, it was a common sight for men walking along a public sidewalk to just turn and openly pee into a hedge.
As for urine fertilizer, I lived for a year with a very eccentric BF here in the US, and one of his many weird quirks was urine collection for his plants. He was a great gardener, and he always peed into a watering can he kept in his bathroom. He expected me to do the same thing.
When he had enough collected he'd go outside the house and "water" his gardens. At night he'd simply bypass the can and treat the plants directly. He got angry when I didn't do the same, if he heard me in the bathroom "wasting" my pee. I have no idea what the neighbors thought of this, but the police never arrived.