People who go outside and smoke near someone else's window. Cigarettes are so disgusting, and I've chosen not to murder my lungs with them, so what makes other people think they have the right to overrule that decision? Selfish bastards; smoke outside your own windows.
People who invite themselves in/over. My brother's grandparents do this every time they drop him off after he's spent time with them. If we wanted you to come in and sit down, we'd have invited you. But we didn't, because...well...we don't want you to come in. Sorry (not really, though).
So it seems my computer has, once again, been infected by text-enhance/browse to save. This time, I cannot find a way to remove it. Here is what I'm talking about: