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'Knock, Knock, Knock, Penny' is arguably the most iconic and frequently used gimmick in Big Bang history.
Instantly recognizable, it adorns merchandise and show memorabilia. Although the knock was first used on
Leonard's door, it's through his visits to Penny for help, advice and solace that the triple-knock is most remembered for.
Pre-triple knock visits.
The Triple Knock collection.
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