Telling no one

"But you have to swear you won't tell anyone."

"I swear, not a soul."

"Swear on your first-born daughter's favorite Barbie."

"I swear."

"Swear on the last slice of pizza you'll ever eat."

"I swear! What's the secret?"

"Wait, swear on the only royal flush you'll ever get in poker."

"...Never."