[srcreigh]

Another example... this Arc code doesn't finish evaluating until a couple round trips with a web browser are finished. Absolutely cursed

    (defop said req
      (aform [w/link (pr "you said: " (arg _ "foo"))
               (pr "click here")]
        (input "foo") 
        (submit)))

(If you didn't know, Arc is implemented in Racket, and powers this site...)

http://paulgraham.com/arcchallenge.html