I copied this to my clipboard for no reason so now you have to see it:

MAYNARD: It reads, 'Here may be found the last words of Joseph of Arimathea. He who is valiant and pure of spirit may find the Holy Grail in the Castle of aaarrrrggh'.

ARTHUR: What?

MAYNARD: '...The Castle of aaarrrrggh'.

BEDEVERE: What is that?

MAYNARD: He must have died while carving it.