Wave your finger around for emphasis. Hold it out firmly and emphatically to make sure that you get the point across.
Do “the X”: cross your middle fingers into an “X,” and then hold them against your chest facing the offender.
The person that you are flipping off might not notice this move. However, it might give other onlookers a laugh.
Make sure that you have the person’s undivided attention. This move takes a bit of time to pull off, and you want to make sure to get the full effect.
Alternately, lean down in front of the person as though you are picking something up off of the ground. Come up flashing your middle finger, and say, “Did you drop this?"[6] X Research source
