take 2: me n dad (roughly translated)

Dad: My boss sent me a poem in our Christmas card, I didn't know what it was, so I asked him and he said it was famous and I should know it.
Me: Oh yeah, what was it?
Dad: It is the T. Was Christmas poem.
Me: I don't know what that is.
Dad: The T. Was Christmas poem.
Me: I've never heard of it?
Dad: T. Was.
Me: Dad. I don't know it.
Mom: Just show her the poem!
(Dad goes and retrieves poem, I read.)
Me: Twas the night before Christmas. Oh. . .yeah Dad, this is pretty famous.
Dad: T. Was the night before Christmas.
Me: Twas.
Dad: T. Was.
Me: Twas, like 'it was.'
Dad: This language is trash: what the fuck is twas!