Have you been busy reading or doing puzzles, etc., and really engrossed in what you are doing, and all of a sudden stop, look up from your task, only to see your pet looking at you (actually staring) with their head cocked to one side, and you can just about know what they are thinking?
And all you can say is, “WHAT?!”
Then they blink and drop their heads or blink and make a mad dash at you as if to say, “What?! You know what! I’m sitting here patiently and you don’t even notice me. And all you can say is ‘What?!’”