Senior Prank Night happened before the school year began at Mystic Falls High School. This happens in the Season 3 episode, The Reckoning, where the seniors go around the school and play pranks, such as placing rat traps on the classrooms floors or gluing shut teachers desks and even putting honey on the door handles.
Klaus crashed the event, however, ruining Elena, Bonnie, Matt, Tyler, and Caroline's plans, while Stefan was forced into becoming the ripper once more. Dana and Chad died at Senior Prank Night because Klaus compelled Stefan to turn his humanity off and kill them. This is also where Tyler is fed blood via Klaus and killed. Bonnie had to find a way to save Tyler in transition into one of Klaus' hybrids from dying and with the help from Matt later succeeds in saving Tyler as he transitions into Klaus' first successful hybrid.
- Dana - Drained of Blood; killed by Stefan Salvatore
- Chad - Drained of Blood; killed by Stefan Salvatore
- Tyler Lockwood - Broken Neck (as a werewolf); killed by Niklaus Mikaelson
- This event took place in the fifth episode of Season Three, The Reckoning.
- This was the episode that Klaus created his first successful hybrid.
- Dana and Chad were killed by Stefan, under Klaus' orders.
- On that event Klaus found out Elena was still alive.
- Rebekah and Elena met for the first time on that event.
- Rebekah mentioned Tatia, but she wasn't mentioned in name. That happened in the episode: Bringing Out The Dead, when The Salvatores were having dinner with Elijah and Klaus.