Untested plugin for getting the inverse of the last selection in jQuery

jquery.inverse.js

(function($) {
    $.fn.inverse = function() {
        var prevSelector = this.prevObject.selector,
        suffix = this.selector.slice(prevSelector.length);
        if (suffix.charAt(0) === " ") {
            // Last action was a find
            return this.prevObject.find(":not(" + suffix.slice(1) + ")");
        } else {
            return this.prevObject.not(this);
        }
    }
}(jQuery));