Rules Lawyer: I want to do X.
Me: You can't do X.
RL: Show me in the rules where it says I can't do X.
Me: It says you have to do X+Y as a single action.
RL: But it doesn't say I *can't* do just X.
RL: You're making me very annoyed!
If game rules don't list everything you *can't* do, then that means you can do anything? What's the point of having rules then?
P.S. Someone else later found where it specifically says you can't do X without doing Y. Just like the rules said in the first place.