Anyone who has worked in an office with a shared coffee pot will immediately relate to this clever flowchart a reader submitted over at Passive Aggressive Notes.
Flowchart fail: if you come across a full or half-full coffee pot and drink it all, you don't brew a fresh one. Also, there's no loop back to the top, so if the pot is empty, you brew a fresh pot but don't drink any. There's also no way not to have wasted coffee left over at the end of the day, because you always make a new pot, even if no one wants any more.
http://graphjam.memebase.com/2008/05/31/song-chart-memes-make-more-coffee/