My split-timing has led me to want to take out years of annoyance about lab quirks on their unsuspecting possessors.  One fellow has a sign on his fume hood sash that reads “Please keep closed when not in use.  THIS MEANS YOU.”  I asked my boss what would happen if I added a “Don’t post passive aggressive notes in the viewing area of fume heads.  THIS MEANS YOU” sign next to it.  Response:  You’d have a lot more free time.