My grandmother used to say to sneak up behind someone with a paper bag and pop it.

My grandmother was about 4'8

You lying sneak."
"All this time pretending to be a wolfblood's best friend, then spying on us."
"You don't understand. I did it to protect ya. When you secret gets out, i'll have the evidence to prove that you're not evil

I don't have the umbilical cord Pop had with each paper.

I think the concept behind it is great,

It's incentive for them. It gets them involved with all kinds of writing.