The document discusses 5 notable events in gaming history:
1) Brown v. EMA - A Supreme Court case that established video games as protected free speech.
2) Formation and closing of Irrational Games - The creators of Bioshock known for story-rich games.
3) The EVE War - An accidental in-game battle involving 28,000 ships, the largest in EVE Online's history.
4) The Corrupted Blood epidemic - A virus in World of Warcraft that spread beyond the game's boundaries.
5) The assassination of Lord British - When a glitch allowed a player to kill an invincible NPC in Ultima Online.