Maybe try a short pencil or something, so you can keep your mouth closed.
The instruction in the experiment aubrey refers to is to hold the pencil with your teeth without touching it with your lips. Holding the pencil with your lips without touching it with your teeth got the opposite result.
Considering how awkward that is, that's not surprising.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.