Supergluing a BB into the valve cap also works, and they might or might not realize its there so tire goes flat they fill it up, and it goes flat again. Not that I would ever do anything like that..
hmmm, dont get me wrong now, but i cant see how this certain person who we refer to, can have enough brains to pump a flat tyre up, or ever know what a valve is, let alone change a wheel.
anyway, i would think BMW, or MERCEDES would have a 24hour roadside pick up and deliver service for their customers.
anyway, its always funny when you hang around just to see what their expressions were when they see their flat tyre.
i've once seen a lady driving a pick up with a flat rear tyre. she pulls over to the side of the road, and doesn't get out. 5 mins later, she starts to drive off again, totally unaware she has a flat tyre. turns out she got a phone call, and pulled over to answer it.
there are many people in the world like this. just never ceases to amaze me.