Grandpa watched Timmy pull a worm out of the ground and told him that if he could put it back in he would give him 10 bucks. Timmy left for a bit and when he returned said "Ok Grandpa, watch this".
Timmy then pushed the worm right back down the hole it came out from. Grandpa got out the 10 bucks and gave it to Timmy.
"Grandpa, I cant keep this because I cheated. I sprayed the worm with hair spray, made it good and stiff. That's why I was able to do that."
"No, you keep it."
The next morning at breakfast Grandpa walked over to Timmy with another 10 bucks.
"No Grandpa. You already paid me."
"That's from Grandma."