What about rabies? :D
Pineapple Surprise is permanently banned from the officer's mess.
I am not allowed to sing "Let's get physical" when I'm using TSM-activated Berserker in physical phase.
"I just wanna get close to you..."?
Apollo's Law- if it needs Clan tech to make it useable, It doesn't deserve those resources in the first place.
Sure it isn't the most practical 'mech ever designed, but it's a hundred ton axe-murderer. If loving that is wrong I don't wanna be right.
I'm no longer permitted to have my character's backstory place them from a neighborhood so rough that "kids would steal the hubcaps off a Typhoon."
I'm no longer allowed to attempt to hack the World of Tanks servers so I can add an Alacorn, Mars, or Gulltoppr.