Have you ever had a colleague who does not seem capable of quickly jumping to a new topic? One whom you can see rebooting the monitor process when you ask a question that is not about exactly what they are doing at that moment?
Not the context-switch of "I'm deep in thought about X, when you interrupt" but the part after that, when you have their attention.
Then add in the annoyed "I have no idea what you are talking about"
my life, several times each week
