Historical clue formulations

• DQ offerings — 2014-02-21
• Drinks with straws — 2012-10-09
• Burger go-withs — 2012-03-02
• Fountain orders — 2009-09-03
• D.T.'s — 2008-09-19
• No great ___ — 2004-08-09
• Dairy Queen orders — 2001-07-09