ArE YoU KiDdInG Me?!?!?!

I've known my friend James for 5 years. Today I make yet another Python reference and he giggles only a little bit while the rest of us are cracking up.
"James! How are you not dying of laughter right now?!" I pretty much yelled at him. "Oh, wait... What is that from?" he said. We all went silent. I told him it was from Monty Python and the Holy Grail.
"I've actually never seen any Monty Python!" So, this weekend we're having a Monty Python marathon at our theatre. Never seen any Python... Guffaw...