What song was this on the Simpson episode?!

Ok I don’t know what episode this is but the song was being played when Bart was trying to prank his Principle but was getting outsmarted because there was a person(forgot the name) telling him what Bart was going to do!. It was like some Irish rock song!.
also at some point of the episode Bart gave the person some blue candy!.Www@Enter-QA@Com

---

---