Spitting

"Put the right amount of wine in your mouth, between one-quarter and one-half ounce. Once you have tasted the wine and are ready to expel it, pucker your lips, tighten your cheeks, and press your tongue up against your top teeth, broadening the tongue so that it extends past the molars on each side. This pools the wine between the top of your tongue and the roof of your mouth. The key is muscle control and force." (adapted from an article in Slate)