Adolescent dog

Seemingly Jack is passing through an adolescent phase; he shows off all the time, can't stay put for longer than five minutes, rollercoaster emotions, etc., etc. Today he was seeking attention by means of a series of impressions; first he did the postman, then his agility/obedience tutor, then several comedians/satirists culminating in a sequence incorporating all the regular members (past and present) of the 'I'm Sorry I Haven't A Clue' team. I tried to ignore him but it was rather good.