PROTIP: If you take notes on paper on clipboards (as doctors must, and as many other people should learn to), get a clipboard with the little clock in the top.

Bonus if it has a calculator. That's so that, besides being useful as a calculator, its design doesn't scream "this is obviously so I can check the time without you even suspecting!, whenever I scribble something, ostensibly just to note stuff that needs doing (→ buy a pack of HDMI extsn cables for conf room prjctr) or people that need emailing (ẽ: jimmy about the flux capacitor)."

Super-duper extra bonus: If the clipboard is one of the new clamshell clipboards. Because those rule the school.

Now you are invincible.