I have a splitting headache.
A splitting headache.
I'm tired and I have a splitting head ache.
He looked up, with a large grin splitting his face.
If you're serious about not splitting, you need him.
Now that's splitting hairs.
As my driver prophesied when I was plowing, they warmed me twice--once while I was splitting them, and again when they were on the fire, so that no fuel could give out more heat.