Here’s a nice picture of how your brain can fool you when you’re dead tired.

In April a late software project forced me to work four weeks in a row without a single day off. Each day I spent some 11 – 13 hours “closing the feature gap”. Of course, more and more I felt like toast each night when I came home.
One night, just before inserting the tooth brush into my mouth I realized that I had applied the tooth paste on the wrong side of the brush. The plastic material is somewhat transparent…