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I used to volunteer at the local annual convention, and a frequent exhibitor has been a guy who had built himself a collection of movie cars, including a replica of the Keaton Batmobile.
At one time, he wanted to display his newly constructed Batmobile "Tumbler" (Nolan/Bale Batman), and showed up with it - on a truck that didn't have any ramp or crane. He enlisted a bunch of volunteers to get it down. We built a ramp by stacking pallets and
rolled the car down it slowly with muscle power. That's one of the weirdest nerdy things I've done.
I kick myself for not having taken pictures...
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It took me a while to understand what it was. Might have been faster if it had balloons.