It takes a lot to convince people to trade in their reasonably-new car for something fresh off the showroom floor. For carmakers, that means lots of big ad campaigns and stunts.

Few have been quite as ballsy as Volvo Trucks' new slackline stunt, which had a woman walking between two trucks as they sped towards a tunnel. We're not entirely sure what it's supposed to tell us about the trucks (smooth ride?), but we want one anyway.

What's the craziest stunt an automaker has pulled to try and sell cars?

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