The truth is funny. Honest discovery, observation, and reaction is better than contrived invention.
The absolute worst thing you can do in a scene is be apathetic.
If the whole is to be Art, the parts must not try to be.
The only real mistake here is ignoring the inner voice.
Trust...trust your fellow actors to support you; trust them to come through if you lay something heavy on them; trust yourself.
I'm tired of being the funniest person in the room.