The first mate was found to be drunk one day and that day it happened
to be the captains turn to write in the ships log so he wrote :

The first mate was drunk today.

He begged and pleaded to the captain to remove that entry but the captain
argued that once an entry was made in the companys log it couldnt be
deleted. The first mate decided to get even.

The next time it when it was the first mates turn to write in the log, he
wrote:

The captain was sober today.