People (more specifically, students) who send me an email and expect a reply within two hours--especially if they sent the email at two in the morning. I check my email at the very least once a day during the semester. Sometimes a lot more times than that. And I answer emails promptly.
But you need to give me at least 24 hours. We do have lives, and are not sitting around just waiting to answer your emails.
And for that matter, people who think they are entitled to things they haven't worked for. If you didn't bother doing your homework all semester and couldn't get up to come to class, WHY do you expect me to work with you, even bend the rules, so you can still pass my class? Just because you want it doesn't mean you should get it.
