I've had to take 2 of my 3 kids to the ER at different times.
I took my daughter twice when she was younger, once when she fell and pushed in her teeth and the other time she had a rash and had vomited (she had strep throat and it was a Friday night when it presented).
I took my younger son once. He'd been roughousing with his brother at WalMart and fell and smacked his chin so hard on the floor that it popped open like a baked potato. He got three stitches!
My older son did have an accident cutting meat once, but the doctor's office was open so I just took him there for stitches.