Today, I discover that the code that I'm supposed to test ... isn't actually in the build. SORRY! Please continue wasting time for two more days. When we are running out of time at the end of the project, you'll get the blame AND we'll expect you to stay late.
This is how people in test become crotchety old farts at the age of 26. Every tester I know has a highly developed sense of irony - it's the only way to keep your sanity in the face of this kind of fuckwittage.