Thats what a dirty old holden does to you, plays nicely then when you least expect it, trys to put you six feet under. My xr6 ute was similar, except was more predictable. Coming up to a corner you would think it was going to be a bit hairy, going through the corner you thought, bugger, this is hairy, coming out the other side thankful you were still alive you changed your y fronts. This would happen on corners marked 65 and doing 65, I shit you not.