Potty Training

I don't know what's wrong with Ethan today.  He kept peeing in his pants.  He would pee by the toilet.  He knew he had the urge to go pee, but he just didn't pee in the little toilet.  I don't know if he just want to play with water or what, cuz each time he peed in his pants, I would take him to the bath tub and rinsed him off.