Focus on OK button in dialog box: bad!
When I'm innocently typing some text and suddenly a dialog box opens, with the focus on the OK button (for instance, the dialog box telling me I can now see a contact's presence), if I'm at the end of a word and hit the space bar just when the dialog box opens, the dialog is dealt with and disappears. Then I just see that I have confirmed something but I haven't had the time to check what it was exactly.
This is bad. Now let's talk about which solution we prefer.
Queue those dialogs?
Put the focus elsewhere in the dialog? (not my choice)
Don't get the focus at all?