The Fairly OddParents S05E12 - Five Days of F.L.A.R.G.

Timmy helps Mark Chang celebrate a Yugopotamian holiday in Dimmsdale, but then finds out that each day of F.L.A.R.G has their own strange meaning that will happen to anyone who celebrates it. Timmy has to handle celebrating F.L.A.R.G with Mark, because if the alien's holiday is interrupted, his appendix will blow up and the planet will be destroyed.