Hiking
A man comes home from a long business trip and finds his son playing with an expensive toy.
"Who bought you that?" asks Dad.
"I did," replies the boy. "I bought it with the money I earned hiking."
"Hiking?" asks his father. "Who pays anyone to go hiking?"
"Mr Jones next door," replies the boy.
"Who bought you that?" asks Dad.
"I did," replies the boy. "I bought it with the money I earned hiking."
"Hiking?" asks his father. "Who pays anyone to go hiking?"
"Mr Jones next door," replies the boy.
Spoiler: