write some obfuscated code
write some cool but completely useless modules like Lingua::Romana::Perligata
inhabit the Chatterbox
write a three page answer to the newest Hash-of-Hashes question
start some flamewars on Slashdot
reload my favorite news page every 5 seconds to make sure I am the first to read the newest article
play a tetris clone
Results (293 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 (163 votes),