Los Pitufos y la capa mágica (Los Pitufos, 43)

Something surprising has happened in the Smurf village. Some Smurfs have undergone a radical personality change: Scaredy Smurf is now brave, Greedy Smurf no longer enjoys food, Lazy Smurf won't stop working, and Grouchy Smurf gets excited about everything. What has happened? Will this be beneficial for the Smurfs? Will they be able to reverse the situation if things take a turn for the worse?