My grandfather worked at bicycle maker Fongers in Groningen, Netherlands for a while. He had the most marvellous bike shed, full of tools and gadgets. He was riding a "brommer" (moped) when I knew him, and had a setup of bottles and cans all hooked together with hoses and valves that he used to mix the gasoline and oil for the brommer. I'm sure the fumes made the whole thing an out-of-body experience, and my dad always wondered that he didn't blow up the whole neighbourhood.