If a friend were coming over and he caught me like coming out of the shower or like masturbating (I'm just kidding I don't masturbate) I would die. ! ! ! ! ! ! ! ! ! ! ! O o o o o o o o o o o
Well, it would be a (bad) surprise if my friend actually came over and I am not at home! :D
On a more serious note, I might have scheduled something for the day or might have plans of meeting someone else or doing some other important work and an unscheduled visit just disrupts the entire plan. Sometimes with disastrous consequences.
I would love a surprise on my Birthday or times like that (when I am actually expecting a surprise, so it is not really a surprise :P ), but otherwise, normal visits where he tells me is coming is great!