I had a keychain with a little locomotive on it. When you yank the chain it would go into a set routine of blowing the whistle and making fart and slow choo choo sounds. When you heard the first whistle you were in for a 40 second routine that was unvaried and unstoppable, short of killing it.
I showed it to a friend who thought it was cute so I said, I'm giving this to you.....if you want to give it to your kid it's on you.
When I left 2 hours later he was regretting his decision to give it to the kid but I was clean.
This year, a gift certificate for $5,000.....toward a new Boeing 737.