Triple High Five
While the common "High Five" features two people, and their hands, slapping together, the "Triple High Five" features three people slapping their hands together. This causes some issues, as the slapping sound is muted, if not completely obliterated, as the three hands coming together form a triangle. It is generally considered to be an impossible feat.
"Dudes, high five!"
"But there are three of us!"
"Then we'll Triple High Five!"
"That's impossible!"