Also, a breakdown in your suspension.
That's not to say Subaru actually encouraged you to take your XT6 over some sweet, sweet jumps. I mean, it says so right there, when it pleads – nay, begs – you not to actually drive that way. But maybe somewhat auspiciously, the company does not point out that Grandma was a professional driver on closed roads.
The Subaru XT6 came in the middle of a golden age for ridiculously overcomplicated cars. In the late-80s and early-90s, computers had just gotten small enough to actually fit into an engine bay, and wearing a calculator on your wrist was actually seen as a cool thing to do. So it followed, then, that automakers would try to shove that same level of technological un-necessity into your car as well.
The XT6 had advancements such as four-wheel turning, which wasn't really necessary in a car with a wheelbase ten inches shorter than a modern Honda Civic, adjustable suspension, which wasn't really necessary because dude it's a Subaru XT6, and an adaptive electrohydraulic steering system, which wasn't really necessary because it uses special hydraulic steering fluid that today seems to only be rivaled in price by saffron.
Relatively few XT6s were sold, but if Grandma can get it airborne, I don't see why.