What you say: "For all professional MBA students this business stats final is going to be a take-home exam."
What I hear: "You can stop listening now, go play on the internet"
What you say: "We're going to work out the proof, but just so that you know you can trust Excel"
What I hear: "Excel works, but I don't want to just tell you to use it all the time so that I feel better about my teaching. You can stop paying attention for the next couple of minutes"