Trickle Treat

"Daddy, what's Trickle Treat?"
"Trickle Treat?  No, Poppet, it's Trick, Or, Treat."
"Oh.  How do you trick or treat?"
"Well, you knock on someones door and say 'Trick or treat!' and if they don't give you a treat, you play a trick on them."
"OK.  Shall we play trick or treat now?  I'll knock on the door and you say you won't give me a treat."
"Sure."
"Knock!  Knock!"
"Hello?"
"Trick or treat!"
"Errr, trick please."
"Ask me my name."
"OK, what's your name?"
"Rubella Witchy!"
"Hello Rubella.  Rubella?  Why is your name Rubella?"
"I've tricked you, my name isn't really Rubella."