A slap administered to the centre of the forehead, pref. on the hairline with the index, middle and ring fingers from the tips to the second knuckles. The flat palm of the hand can also be used but is morely likely to provoke a fist-shaped retaliation. Action must be accompanied by the shouting of the word upon impact viz: "SPAM!!!"
Spammer approaches Spammee, and taps on shoulder. As the Spammee turns, the Spammer lunges, shouting "SPAM!" momentarily confusing and disorienting the victim, but more significantly, irritating them.