Hotel guests... especially ones that come to the desk and checkout, then tell me they will vacate the room in an hour, after I've already checked them out in the system and can't check them back in. Also, when callers trying to set a reservation ask me the same question several times, forcing me to give them the same answer several times. Also when people call and ask to book a reservation and upon asking them for their arrival date they have to think about it or scrounge around for the actual date. Seriously, isn't that something you should've had figured out before wasting my time? Didn't they think I'd have to know that information to book a room for them? Or are they just pretending to have to think about it? Oh and people that call and give me their full name and where they are from immediately. Am I supposed to recognize who they are? I take about 75-100 calls per day, I don't care what your name is until I ask for it. Oh, and humidity.