221 Kan. 304, 559 P.2d 790 (Kan. 1977)
Berryman v. Kmoch is a staple contracts case that sharpens two core doctrines: the requirement of consideration to render an option irrevocable, and the limited role of promissory estoppel in salvaging an otherwise revocable offer.
1) Whether an option agreement that recites payment of nominal consideration, which was never actually paid, is irrevocable; and 2) whether the optionee's reliance activities, absent paid consideration, render the offer irrevocable under promissory estoppel.
An option is a separate contract that requires consideration to be irrevocable; a mere recital of consideration is not conclusive and may be rebutted by proof that no consideration was paid. Absent consideration, the option is simply a revocable offer that may be withdrawn any time prior to acceptance. Promissory estoppel may, in limited circumstances, render an offer irrevocable if the offeror should reasonably expect to induce action or forbearance of a substantial character; such reliance must actually occur, be foreseeable, and enforcement must be necessary to avoid injustice. Preparatory or self-interested efforts not induced by the offer, or not substantial, do not suffice.
The option was revocable because the recited $10 consideration was never paid; the recital could be contradicted by evidence of nonpayment. Promissory estoppel did not apply because Kmoch's expenditures to find investors were not substantial, were not the type of reliance the option invited or the offeror should reasonably have expected, and were not shown to be induced by the offer in a way that would justify making the offer irrevocable.
Berryman v. Kmoch teaches that options must be supported by real consideration to be irrevocable; a boilerplate recital does not substitute for payment. It also cabins promissory estoppel, refusing to convert ordinary, preparatory business efforts into the kind of substantial, foreseeable reliance that bars revocation. For exam purposes, the case is a clear illustration of: (1) the difference between an option and a revocable offer; (2) the evidentiary flexibility to rebut a consideration recital; and (3) the limits of reliance as a substitute for consideration.