Historical clue formulations

• Like a jack-o'-lantern — 2016-07-06
• Like jack-o'-lanterns or meaningless victories — 2015-04-06
• Insincere — 2015-04-01
• Meaningless — 2011-07-10
• Like a jack-o'-lantern — 2009-11-11
• Meaningless — 2005-10-23
• Like jack-o'-lanterns — 2003-09-25
• Like the Trojan horse — 1998-08-30