So we had been playing WFRP for a long time. Our characters were baddddd. My dwarf, in particular, mowed through foes. So the GM had some really, really nasty giant made up, and he faced my dwarf one-on-one, while the rest of the party battled other things. It was going bad for my poor Rolf. Then the GM mistakenly skipped me in the Init, and rolled well enough to totally kill poor Rolf.
We had that sort of thing happen enough that we had a rule that "preemptive rolls" -always- carried. So unless I killed the giant, I was done for.
We stopped and calculated what I needed to do. I had to roll to hit (78), roll a 6 on the d6, roll to confirm the "crit" (sorta, that's how WFRP worked) and then roll 2 more sixes on the d6, and then a 5.
Which this thread being what it is, is exactly what I proceded to do.
That was 10 years ago, and I still remember it.