Bumper bubbles, also known as bubble soccer, are inflatable spheres that are worn by players like a giant bubble suit. Players can then bump into each other while attempting to score a goal.
There is a funny story about bumper bubbles, I once heard of a game where the players were so competitive that they forgot they were wearing the bubbles and kept colliding into each other even after the game had ended. They ended up rolling around on the field, bouncing into each other like giant beach balls, and everyone was laughing so hard that they couldn't stop. It was a hilarious and memorable moment for everyone involved, and they all agreed to play bumper bubble soccer again soon.
You may also be interested in the following articles:What is a bumper bubble?: