Historical clue formulations

• It might give you a headache — 2014-11-29
• Absence justification — 2014-08-24
• It may leave you weak in the knees — 2013-10-20
• Susan Sontag's "_____ as Metaphor" — 1995-12-17
• Hypochondriac's preoccupation — 1994-06-19