I don't mean to laugh as it is pretty shocking, but this has just reminded me of a conversation I had with my OH when I told him about Indies enthusiasm for jumping and he was like "have you ever jumped her over a car or a motorbike?" the way the male mind works eh?! I would show him this when I see him later but it may give him ideas! lol!
They did some pretty freaky stuff with Snowman - he was an advertising star as well, I believe.
I have a picture of a horse jumping another horse at some sort of stallion show and I've seen at least one similar video. I think I've also seen someone jumping a cow! (In both senses, over one and riding one.)
The course at Badminton still contains two truck beds, doesn't it? And I've known a few people who have jumped horses over car hoods but they're all pretty much bonkers - one even ended an almost certain Olympic bid by permanently damaging himself when he missed.