I was thinking more along the lines of...
"Johnny, why don't you really surprise Daddy and spread a couple tablespoons of powdered sugar on the bed sheets?"
"Johnny, what do you suppose would happen if you put a thin bead of Krazy Glue on Daddy's toilet seat?"
"Johnny, wouldn't it be fun, if when Daddy throws out burned out lightbulbs, you got them out of the trash and hid them for a couple of days and then screwed them back into the lamp he took them out of."
But then, I've had lots of practice at this sort of thing!
--Boot Hill
Maybe next year. She is only 20 months now! But daddy is going to get a big surprise when she get's into her car and insists on "Go Fly"!
We had just put the kid into the car seat and my wife was leaning in to hug her goodbye when the kid said "sh!t"! We didn't understand as she still had her booper in her mouth so my wife asked her what? The kid said "sh!t". The third time we realized what it sounded like.
We both looked and mom and said "She didn't learn that here!" (that was the first time we had heard her say it) Mom (redfaced) confessed.