ANSWERS: 1
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He is responding to his stage managers'(Biff Henderson) rude insistance to him several months ago - when Dave was close to running late at the start of a show. Biff had been nagging Dave (by tapping his watch to Dave), insisting that he was going to mess up the shows' timing by being unprepared to start the show. Dave has been doing this show for many years (30?) and he found Biff's remark a bit overbearing - so now - as kind of a dig - he turns to Biff and taps his watch just to remind him who's boss!
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