Zelretch is bored. So, as per his usual idiom, he decides to annoy someone. He decides to annoy Saber, by sending her a copy of "Monty Python and the Holy Grail"...

To be honest, no one knew why the Holy Grail would be in Japan. And no matter how hared they might try, they could never find out who put up the inaccurate subtitles in the opening credits. No one knew why Berserker liked dramatic entrances. The biggest question was as to why Arthur Pendragon was a woman, why she preferred to use coconuts and her Master as a Noble Steed.

Proof that the Nasuverse can be a very silly place. Rather than the normal summons, characters from Monty Python's Holy Grail are summoned. This is unabashedly a work of crack, check your sanity at the door.