Pat and Stan is an animated series that appeared as part of the French children's program TFOU on the channel TF1. There is also a film about the brown hippo and the yellow dog, about 26 minutes long. However, the duo is best known for the clip in which Pat sings "The Lion Sleeps Tonight", which appeared as part of a Ferrero children's chocolate commercial. The chocolate snack "Happy Hippo" from Ferrero was introduced to match this.