Improper tool uses.

1. Never pick your teeth with an awl.
2. Despite what your coworkers say, dry line chalk tastes really bad. When it is breezy try and work up wind if you are snapping lines.
3. Never, never, never hold 16 penny sinkers ( the green lubricated ones) in your mouth. I hope I don't need to elaborate what can go wrong.
4. Don't tell your buddy a funny joke when he's working with a nail gun.
5. You are not helping anyone when you have an old tape measure and the hook/tip can be jiggled a quarter of an inch. You will get yelled at. They will throw it off the barge.
6. Try to remember to unbuckle your tools before you go into the office, you will knock the plants off the secretary's desk.