The tin can twins can keep a secret.  From Together, 1958.

From The Old Line, 1948.

From The Psychiatric Bulletin, 1958.

It's so rare to see a yearbook acknowledge how we're all doubled.  "The one-that-is is always two, and this is where we find ourselves, we are and we are doubled. ... To be is to be doubled.  Not to be is to be absolutely single" (Charles M. Stang, Our Divine Double).  From Cleveland Technical's 1984 yearbook.

A doppelgänger from Wizardry III: Legacy of Llylgamyn, The Third Scenario handbook.

A doppelgänger from the Wizardry III: Legacy of Llylgamyn handbook.

From Nebelspalter, 1930.

From The Film Daily, 1938.

From St. Joseph's 1937 yearbook.

Reblog if you have two heads but only your grotesque head met graduation requirements.  From Queens College's 1973 yearbook.

It's all too rare to see a student's mirror-world double appear in a yearbook.  It's even rarer for the student and his mirror-world double to be up a tree (not to mention wearing matching capes).  Due to the marvelous light flare, we'll never know what one of his faces looked like.  From Guilford's 1976 yearbook.