Apparently this is actually now a thing and the latest craze in car interior modification. Can't say I'm entirely convinced. What's wrong with furry dice and a Feu Orange air freshener? ?
I was just thinking something similar... a rear end shunt might see the passenger with a lap full of dirt and cactus!
A prick in the prick can't be fun!
Isn't the cactus on the air bag. It's bad enough an air bag going off in your face it can break noses, could be interesting with a cactus being launched in your face at what ever speed it would go.