The Fairly OddParents: Season 5, Episode 18
Timmy the Barbarian/No Substitute for Crazy (12 Apr. 2006)
Binky's sick, so Jorgen shows up with some soup and a bedtime story to make him feel better. The story is "Timmy the Barbarian," and as Jorgen tells it to Binky, poor Timmy, Cosmo and Wanda find themselves actually living it!