The Ace Hardware

Years ago, when his sons were 2 and 4, my brother's brother-in-law had his boys with him to run some errands. While at the hardware store, he could smell a dirty diaper and knew he'd be changing it once they got back home. But, at home, he found the diaper was empty, and said to the 2-year-old, "I thought you pooped, but there's nothing here, what happened?"
Came the response, "I left it at the Ace Hardware!"