What do "ouchie" and "Sharpie" have in common?

The other day Apollo came into the dining room saying, "I wanna ouchie, I wanna ouchie." He was looking upward as he was saying it (I keep some of my craft supplies up high for good reason). I couldn't figure out for the life of me what he was meaning. So I let him know I didn't know what he meant. No biggie. He found something else to interest him.









The following day, while in Sarah's room Apollo picked up a Sharpie and said, "ouchie," with a big smile on his face.

To Apollo, they're one and the same.