*I may no longer use Ghostform, Greater Invisibility, and Blink. Ever.
**Especially if I use it to hide in the BBEG's chair.
***ESPECIALLY if i then cast silenced Maximized Explosive Runes on his armrest.
****Even if I could totally do it.

*I may not put "invented Monopoly" as reason why my character is Ebil.

*I may not create a fighter based on a spartan soldier.
**Not even in a campaign based on Ancient Greece, where all the players are Spartans.
***I also may not make a Halo Spartan in my DM's campaign.

*I may not rule that Electric Eels exist, and that the shark can spit them at a player who is severely annoying me. Especially if the Character is vulnerable to lightning. Especially if each eel does 500d4 damage, no save, on a hit.
**Even if he's otherwise invulnerable.