Create by Barney a.k.a. "The Barnacle" (Neil Patrick Harris), a fasting-talking ladies man, the "Lemon Law" allowed Barney to drop his date within five minutes of meeting them and not feel ashamed or guilty at doing so. See a fuller explanation of the "Lemon Law" below (which is posted on the back of each Lemon Law card):

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The Lemon Law may be invoked if, at any point during the initial five minutes (300 seconds) of a first date, either party deems the union hopeless and elects to abort said date in the interest of time and/or self-respect. Receipt of this card hereby absolves the Giver from any "Hard feelings" or "Questions" from the Lemon Lawyee relevant to the discontinuance of the date, which may be terminated for any reason including, but not limited to: tawdry attire, breath, homeliness, misplaced/excessive body hair, Long Island accent, public school education, bad credit, no credit, suspicious odor(s).

Addenda

(i) Giver may waive the Lemon Law should Lemon Lawyee immediately consent to a no-strings attached "Stand" duration of which shall be no longer that one (1) night.
(ii) The terms of this agreement are non exclusively transferable, in deference to the emergence of the Lemon Law as a "Thing."
(iii) In the unlikely event of a simultaneous invocation, parties shall exact one (1) "High Five" with neither party officially assuming credit for the Lemon Law issuance.