Don't watch over my shoulder when I'm working.
If you could implement one rule with your coworkers, what would that rule be?
Get caught using your cell phone on company time and lose your coffee break.
If a tool gets taken from my truck to use,put it back when they are done with it. Too many times they either leave it lay or throw it in their vehicle at the end of the day. That REALLY irks me.
You're absolutely positively required to perform the work according to the job description you were hired and over-paid to do.
If you're sick, stay home. Don't cough and sneeze and not wash your hands.
Step up for once when you see a coworker struggling and give them a hand.
Do what you say you're going to do; follow through as necessary to make sure it all got done.
If you have information that is vital for your coworkers to know as they are doing their job, share that knowledge with the rest of the team.