You're on a train, or in a coffee shop. You want to simply switch your MacBook into a mode that is more suitable for that environment. TrainMode can help.
It can switch of your Wifi when it's not needed, turn your sound down and dim your screen all with a single click. It will then revert back to the original settings when you choose. It's that simple.
Alfred Extension
Lets you control TrainMode from Alfred, turning it on and off with simple commands.