TIM:
To the north there lies a cave-- the cave of Caerbannog-- wherein, carved in mystic runes upon the very living rock, the last words of Olfin Bedwere of Rheged...
[boom]
...make plain the last resting place of the most Holy Grail.
ARTHUR:
Where could we find this cave, O Tim?
TIM:
Follow. But! Follow only if ye be men of valour, for the entrance to this cave is guarded by a creature so foul, so cruel that no man yet has fought with it and lived! Bones of full fifty men lie strewn about its lair. So, brave knights, if you do doubt your courage or your strength, come no further, for death awaits you all with nasty, big, pointy teeth.
John Cleese spits like a maniac in that scene!