Dad:
"Say daddy!"
Baby:
"Mommy!"

Dad:
"Come on, say daddy!"
Baby:
"Mommy!"

Dad:
"Dаrn it, say daddy!"
Baby:
"Dаrn it, Mommy!"

[Mom comes home and joins the conversation.]
Mom:
"Honey, I'm home!"
Baby:
"Dаrn it!"

Mom:
"Who taught you that?"
Baby:
"Daddy!"
Dad: ...