How many times this semester have I had this conversation?
Any student: "Can I come see you about [fillintheblank]?"
Me: "Of course. Why don't you stop by during my office hours?"
Student: "When are your office hours again?"
Me: "Monday, Tuesday, Thursday, and Friday from 9 to 10."
Student pauses, thinks, finally says: "Okay! I'll come by on Wednesday." Scribbles a note in his/her calendar.
Me: "Uh, actually--oh, all right. I'll see you then." (I'm in my office anyway, after all, and who needs the confusion....)