The night before I had an oral exam about history of Communication Studies at university, I was too excited about learning PHP (ikr, that was 5 years ago). I mailed the professor an apology and stated the real reason I would skip this exam. When I still showed up at 9 in the morning without having slept, he told me "that's the most honest mail I've ever had" and gave me a 2/20 for showing up. (At the third exam period I studied it properly and got an 18/20)