Big pointy teeth

big pointy teeth, phrase the natural weaponry of a fierce creature; sometimes spoken with fingers in front of mouth, demonstrating said teeth. See vorpal bunny. [JP]
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Addendum: Spoken by Tim the Enchanter (John Cleese) in Terry Gilliam & Terry Jones' 1975 classic Monty Python and the Holy Grail. [JP]
Tim the Enchanter: 
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.''
Arthur, King of the Britons: 
What an eccentric performance.''