2 dismissals = 0 lawsuit.

A little-known but powerful part of Fed. R. Civ. P. 41(b) provides: “[I]f the plaintiff previously dismissed any federal- or state-court action based on or including the same claim, a notice of dismissal operates as an adjudication on the merits.”   The Fifth Circuit affirmed a dismissal under this rule in Cabot Golf CL-PP 1, LLC v. Nixon Peabody, No. 13-40912 (July 7, 2014, unpublished).  It began by noting that, in this context, the distinction between Rule 12 and Rule 56 was immaterial, where “the material facts are undisputed, and we address a pure question of law.”  On the merits, Plaintiff had filed a state lawsuit, filed a federal lawsuit, dismissed the state action, and then dismissed the federal case with a unilateral notice.  Plaintiff argued that the 2-dismissal rule “should apply only to serial litigation (i.e., suits which are filed after the earlier suits were dismissed), not to parallel/tandem litigation as in this case (i.e., suits which were already pending when the earlier suits were dismisssed).”  The Court rejected that argument as unsupported by case law or the plain terms of the Rule.