1. Run a tournament.
2. 11 players show up.
3. 12th player joins so there's an even number.
4. Set round 1 pairings.
5. 13th player arrives after all matches are set, but before turn 1 begins.
6. Give player 13 the bye.
6. Reset all pairings and make everybody move.
7. Fast forward to the top 4 cut.
8. Top 4 is announced, but 3rd place has to leave.
9. Bump 4th place to 3rd and 5th to 4th.
9. Have a top 3 instead.
10. Give 1st place a bye into the final round and have 2nd and 4th play to meet him there.
10. Keep matches seeded as they were, forcing 1st place to play 4th while 2nd gets a bye into the final.
/rant