The Smurfs S2 Ep 31 - Body Swaps

Season 2 Episode 31 Turncoat Smurf
By the following day, the village leader shows the potion to his little Smurfs, calling it a personality improver for Gargamel. As the Smurfs cheer, Clumsy slaps Papa Smurf on the back, causing him to douse the potion on both Smurfette and Grouchy, who are standing nearby. Then Papa Smurf notices that his personality improver actually was a personality exchanger, as Smurfette and Grouchy both switched personalities with each other.