Historical clue formulations

• Knocking onomatopoeia — 2024-02-25
• It's a rap — 2021-03-19
• Rapping sound — 2019-02-06
• Rapping — 2018-10-20
• Rap sound — 2018-03-04
• Drumming sound — 2017-12-16
• Snare drum sound — 2017-09-10
• Snare drum sound — 2015-07-18
• Sharp knock — 2014-01-18
• Machine gun sound — 2012-01-03
• Knocking sound — 2011-06-29
• Knock noise — 2010-12-25
• Automatic sound — 2009-03-07
• War movie sound effect — 2008-08-21
• Gatling gun sound — 2008-05-03
• Battle report? — 2007-08-26
• Sound of a woodpecker pecking — 2006-11-25
• Rapper's beat — 2005-01-14
• Knock — 2004-10-10
• Sound made by a rapper — 2003-07-04
• Knocking sound — 2002-02-21
• Rapper's noise — 2001-02-09
• Knocking sound — 2000-03-29
• Gunfire sound — 1998-10-11
• Rapper's sound — 1997-02-08
• Machine gun noise — 1996-05-05
• Tommy gun noise — 1995-07-24
• Knocking sound — 1994-03-28