Chattanooga Choo Choo Puns

When my sons were 4 and 6 I had them trained.

I would belch, then say "Pardon me boys,"

They knew to reply "Is that the Chattanooga Choo-Choo?"

They didn't really understand it, but they thought it was funny. So did I.

Now they are 10 and 12 and they refuse to do it. They groan if I ask them to. Nope. Not on pain of death.

Still funny though!