Open an oyster
Hold the oyster in your hand with the cup-shaped part downwards, the pointed hinge end nearest you. Slip your knife into the join between the lid and the cup. You may have to twist it a little to get access, but be careful not to grind too hard as you'll get flaky bits of shell in the oyster. Once your knife blade is in, slide it down towards the hinge and cut the hinge. The oyster will then open.