Part of a pro set called Uniformed Unicorn in which you have all like cards in a formation that can't be stolen.
Flipping over a table, causing destruction to the perimeter, or fighting players. Tossing cards around. There is no actual penalty for this, but you can create a house rule.
Acting a fool in any manner because you lost or being a sore loser. There is no actual penalty for this, but you can create a house rule.
An advantage that happens in capture the flag when an opponent is in control of the flag and get an extra turn each round.