Place the
Chattering Teeth into the Mummy (Dead Cousin Ted) during the Best Human contest.
WARNING! THIS IS MIISSABLE! Though it doesn't take very long to replay this game, maybe an hour if you're skipping all of the cutscenes.
*** Spoiler - click to reveal ***At some point in the story, you will need Laverne to put Roller Skates and a Name Tag on the Mummy and push it down the stairs to enter it into the Best Human contest. Once the Mummy crashes into the other contestants (and a brief cutscene), you will need Laverne to go to the 3rd floor to enter the contest.
WARNING! As pointed out by @Lonesquiff and @MacQuince in the comments, you will need to give the Chattering Teeth to the Mummy BEFORE giving them to George Washington, or else you will lose the opportunity to do so.
The
Chattering Teeth can be picked up by Bernard (
kid with glasses in the present). From the Main Lobby where you start the game, open/go through the double doors underneath the WELCOME banner. Then, open the grate on the ground in front of the fireplace. Once open, head to the right of this room, past the Salesman, to the Vat'o'Teeth. Go past it and the
Chattering Teeth will jump down to the ground. What I did was slowly work my way left, always going towards the front of the screen. Once I got to the clown balloon, I made my way to the back of the room until the
Chattering Teeth got stuck in the opening of the grate.
Pick up the
Chattering Teeth, open your inventory, click on the
Chattering Teeth, then click on Laverne to have the teeth automatically placed into Laverne's inventory. Switch to Laverne.
As Laverne, with the Mummy and the other contestants on the 3rd floor, open your inventory, click on the Chattering Teeth, then click on the Mummy.
Laverne will say "
Stop chattering, mummy!" as your achievement pops.
If you see a way to improve this guide or want further clarification, leave a comment! Thanks!