Keep You’re Hair On!

There once was a small jokester called Joey, who was visting at his Grandpa’s. Now Grandpa was rather short of temper, so after Joey had been standing in the doorway for 5 minutes, trying to decide whether or not to go outside, he said, ”Hurry up, now will you?”
Joey turned around and frowned. ”Keep your hair on,” he grumbled. Seeing Grandpa’s bald head, he giggled, ”Opps! To late!”