Doing a meditation, I had a random idea to make a post on tongue tricks I know of. Without further ado, here it is.

• When running, keep your tongue inside your teeth, even if you are panting: as pointed out to me by a Krav Maga trainer, you don’t want your tongue caught between your teeth if you can fall or be hit on your jaw. This took a small bit of attention to practice and soon it became my default.
• When you have an urge to sneeze and don’t want to sneeze, rub your tongue against the palate of your mouth (i.e. the ribbed part on the upper part of your mouth). For some reason this suppresses the sneezing impuls (conflicting sensations in the same nerve bundle?). Interestingly, it does not work the other way around: rubbing the palate of your mouth does not have you sneeze.
• When you have muscle tension in your jaw, relax the muscles and use your tongue to slightly open your mouth. Much more relaxing!
• When you are playing with energy, especially micro-cosmic orbit, place the tip of your tongue gently on the palate of your mouth (I rest it against my front teeth). Supposedly this helps guide the energy down again. All I know is that it helps prevent headaches I got doing energy play without this.