Using the syringe with LeChuck's voodoo doll

After completing the doll, there's a good chance that the doll will end up on the third column of the third row of the inventory and the syringe will be right below it (or vice versa). In this case, position the cursor on the third column of the third row and then, **without moving the mouse cursor**, press Enter, then the down arrow, and Enter once again.