The TA for my computing lab in uni consistently shows up 45 minutes late. I'm usually done in 20 because I use the rest of the time to work on the next lab.

He walks through the door, lets out the biggest sigh, sits down, sighs again, opens up his laptop, and sighs once more. When someone asks for help, he sighs so hard you can see his lungs shrivel up as he exhales, and then provides them with a pointless answer.

The best part about the cs department here is that when you join cs, you are given an account to use with the ubuntu machines in the computer labs. They send you the password over school email, and you can't change it on any system they provide.