I'll start with mine...
See the Vulcans were sneaky folks.. That is an eye jab with either the fingers (they support each other), thumb jab (run the hand down the side of their face and jab 'em in the eye) .. groin grabber, or palm them on the nose, or run the arm over your should and 'tiger paw' them on the nose from above.
They may laugh when you give 'em the Vulcan peace sign... in fact you want them to laugh... and drop their guard!