It is not clear to me whether you mean to display
both the input phrase and the output result or just one of
them. If you mean to display both, then I think my favorites
would be Ewart Shaw's oneliner "life", and some part of the
following oneliner extracted from the Vocabulary.
(<;.3 y) ; ((($$y)$<./$y)<;.3 y) ; (a <;.3 y) ; <(a <;._3
y)[(y=: a. {~ (a. i. 'a') + i. 4 4);(a=: 1 1 ,: 2 2)
(B=)
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