Gilbert the Goblin's beachside vacation gets ruined by mermaids and their games in the side-splitting latest installment in The Worst picture book series, where even the strangest of creatures can become the best of friends. Who doesn't love a good vacation? Soaking up some sun, floating on the waves and...arm wrestling an octopus? When mermaids show up in the middle of Gilbert's goblin getaway, their fin-flapping festivities quickly...