Ok, this has been annoying me for quite some time:
My boss ringing me on my blackberry first thing in the morning, so I ignore it and then he rings my telephone on the desk and he goes through to voicemail, but doesn't leave a message, then he rings my personal mobile, I don't answer it and he doesn't leave a message. When I ring back (after I've taken my coat off, got a coffee and sat down) I find out that it wasn't urgent he just wanted a chat.