Since my FI and I got engaged, everyone we know has had a wealth of advice for us on how to make it work. A lot of it has been great, but some of it has been seriously stinky. The worst advice we've been given is the old favorite "never go to bed angry." Everything we've learned has taught us that it's bad advice. Sometimes you need time to think over exactly why you're angry, then you can come together and fix it like grown ups. How are you supposed to never go to bed angry? The best I can figure, you either pretend to make up even if you're still upset, or stay up and fight.
So, what's the worst advice you've been given? It can be something that conflicts with your personal ideals of a relationship, something you don't care for, or something that is just plain incorrect.