Speaking of reserved words, I remember reading once about how PL/I had no reserved words. Which has the nice quirk that this is valid code: IF IF = THEN TH

Speaking of reserved words, I remember reading once about how PL/I had no reserved words. Which has the nice quirk that this is valid code: IF IF = THEN THEN THEN = ELSE ELSE ELSE = ENDIF ENDIF ...assuming IF, THEN, ELSE, and ENDIF are all variables.