The number of times I've accidentally casted Jolt II while sitting on an Impact proc is embarrassing. And even worse still is deciding if I should cancel the Jolt II midcast so I can dump my Impact proc and decide that's the route I will take about 80% into my Jolt II cast. Then after interrupting my Jolt II (deep into the cast) i start casting Impact and before it finishes casting Impactful wears off.