I was at work and one of my coworkers (female) walks through the door and says good morning, to which I say hi rather quietly. She then, rather loudly says "GOOD MORNING" as if I owed it to her to acknowledge her. The next woman was a customer walking out the door, and I work in customer service. She walks by and says good morning and the first woman says good morning to her and I kinda said it quietly again (I'm not much of a morning person). She then, even louder than the other girl shouts "GOOD MORNING!!!" and turns to look at me. So I appeased her and said it back just because it's my job to do that. She then looked at her friend and shook her head while departing. These were relatively attractive women surface-wise.

Obviously it's not that good of a morning for you to be so easily ticked off.