"Show me your belly button!" he sang. They smiled broadly and looked at their stomachs.
"Show me your belly button!" Broader smiles, general pointing at their stomachs.
"Where's your belly button?" he asked encouragingly.
Watching this, I felt bad for him, so I called out, "MARDI GRAS!"
Instantly, the kids grinned, grabbed their shirts, and lifted them all the way up. The father looked at them, then at me.
"Um. We've been learning some tricks," I said.