If a meteorite the size of a house brick were to strike Loch Ness, all life within the Loch would be ended and thus conclusive proof of the exictence or otherwise of Nessis would be garnered.
If you perfectly relax all the muscles in your tongue and throat, and gently take hold of it with a pair of sugar tongs, it is possible to pull it out from the mouth a distance of six inches or more. However, if you do this you will not be able to fit it back in again without surgical intervention.