Before writing the body: it's a lead in
After writing the body: it's a summary
Never: it's redundant
In uppercase: it might be ignored otherwise
As the entire message: I'm a PHB
Results (525 votes), past polls
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (152 votes),