I've just been listening to Radio 4's popular 'quiz' show, where contestants have to talk for one minute on any given subject without hestitation, repetition or deviation. Whilst listening, Lucy was driving me nuts, barking like mad every half a minute or so - I couldn't figure it out, and she wouldn't settle. So I turned off the radio to go downstairs with her - and it stopped!
No more barky madness. Then I finally twigged - the buzzer used by contestants on 'Just A Minute' sounds exactly like our doorbell - no wonder she was so frustrated when I just carried on typing and listening to the radio!