You caught me...
Of the many days that I don't fail (usually 364/365), I happened to fail today:
Just like aforementioned, I was at school, when I am also walking in the hallway. It's the middle of the year, and I am thinking about classes, when suddenly I find myself in another class. I've been sitting there for about 10 minutes, and no one has noticed when the teacher asked me wtf am I. I get up and say "I was just conducting tests. As you were.......peasants...."
I have never failed quite as much as that.