Munich Surfer Dude 1

To create streams and water features in the English Garden, those efficient Germans just diverted the Isar river into the park. As the water returns to the Isar, it exits through some drainage channels and this one generates large enough waves for guys to surf on them. They would jump on the wave and ride back and forth for about 30 seconds before falling back, swimming to shore and hiking back up for more. Quite unexpected in the middle of a European city.