Historical clue formulations

• Like most oatmeal — 2019-10-20
• Like some mattresses and batter — 2016-11-24
• Like some gravy and mattresses — 2002-12-23
• Like inferior gravy — 2001-11-20
• Not evenly padded, as a mattress — 1996-12-16
• Like an old mattress — 1994-11-01