gistfile1.js

Template.movie.events({
    'click .seen': function (e, t) {
        // User has set status to "seen", but not exited poster
        Session.set('seen-movie', true);
    },
    'click .not-seen': function (e, t) {
        // User has set status to "not seen", but not exited poster
        Session.set('seen-movie', false);
    }
    'mouseout .poster': function (e, t) {
        // They've moused out of the poster
        if (! Session.equals('seen-movie', null)) {
            // They've selected a status
            Movies.update({ _id: movieIdHere }, {$set: { seen: Session.get('seen-movie') } });
            Session.set('seen-movie', null); // Reset this
        }
    }
});

Template.movie.seen = function () { return Session.get('seen-movie'); }

gistfile2.html

<template name="movie">
    {{#if seen}}
     <p class="status">Yeah, you've seen it</p>
     {{else}}
     <p class="status">Nope, got to see this</p>
     {{/if}}
</template>