Their Forester must be stronger then most cars. I've hit a deer at 55mph in my Tacoma and there was damage to my truck and the deer definitely didn't mist. You see them hit on the freeway all the time by semi trucks and there are definitely huge pieces of the deer left. Enough that you know exactly what animal they were. Not saying that your parents car didn't magically poof the deer, but your parents car magically poofed the deer. Or you're not remembering correctly.