Order some joke/fake lottery tickets. One of the ones where every ticket wins $30k. Drop one on his driveway before he heads to work in the AM for him to find. I’ve only done this to two people and they both fell hook, line, and sinker for it. One lady was calling her husband to come pick up the winning ticket to keep it safe.
What’s really hard is getting a 5 year old to understand this before you run out of energy from trying to hold their seat and run at the same time.