Gravity Falls Episode 12 Summerween Episode Title:Summerween.Episode Description:The people of Gravity Falls love Halloween so much that they also celebrate it in summer, with jack-o'-melons and much trick-or-treating. Dipper and Mabel are excited to join in on the fun, but when Wendy casually mentions that trick-or-treating is for kids, Dipper's outlook on the evening changes. The night gets even more complicated when a monster that Dipper accidentally insulted makes them fulfill his candy quota by the night's end, or else he will eat them.