When you're doing a
girl from behind, and
switch with your friend halfway through without her noticing. (aka The Magic Trick, but your friend is acting as your sidekick)
You
go stand near the open window in front of them, spank it until you
cum, then “Spiderman” her in the eye, as your friend kicks her in the shin. Turning her into the angry hulk/pirate.
Your friend then proceeds to perform an Angry Dragon on her, while declaring “Justice Has Been Served!”