Ten Second Rule

Variants include the three, five, or seven second rule, but rarely further than that.

Refers to the ammount of time a person must be out of their seat before it becomes avaliable for others to steal

*Person 1 gets out of seat*
Person 2: Ten second rule!
*Person 2 collapses smugly into seat. Person 1 may choose to comment upon the sexual orientation of Person 2's mother at this time*