You DO NOT NEED to add 2 spaces after every period when you are typing. That went out with the typewriter. Stop it.
If you are walking somewhere, anywhere, DO NOT stop in the middle of passageways or doorways or anywhere where someone might want to get through or past you. MOVE OUT OF THE WAY.
If you are driving and turning, there is NO NEED to slow down to a complete STOP before you turn.
If you are driving on the highway, and are about to take an exit ramp, you DO NOT NEED to slow down BEFORE you get on the ramp. That is what the ramp IS FOR.
If you use the last of the toilet paper, CHANGE THE ROLL.
Also, there is rarely any need to REPLY ALL. Stop it.
This has been a public service announcement. Feel free to expand.