My last test in the last semester was a disaster!
Why?
Because I wasn't there!
Yes!
Right!
Aaaargh!

I wrote the date down in my calendar two months before the test - to be sure, that I won't forget it! I learned about five days for it and the evening before the test I went to the webpage of the university to check again for the room in which it was supposed to be held. Ah, ok, there!
Me being paranoid about such things, I went about two hours later again checking for the room "to be really, absolutely sure" and in the moment I wanted to close the browser-tab, I noticed.... the test was today! :(