Another etiquette question

[Boris]

Let's say you have a block of 4 tickets to an assigned seating entertainment event. One friend buys the tix and then distributes them before the event. Should you sit in your exact assigned seat or any one of the 4 seats assigned to your group? What if one of your friends sits in your assigned seat. Should you pull rank and say dude that's my seat? Is that an A-hole thing to do or not?