Question: "'Tis the Fifteenth Season" is the seventh episode of "The Simpsons"' fifteenth season, and the seventh Christmas-themed episode overall, this episode is notable as being the first to make reference to Lisa's Buddhism since she converted in which earlier Christmas episode, which is the sixth episode, of "The Simpsons"' thirteenth season?
Sentence (from "Blame It on Lisa"): Lisa soon discovers that Ronaldo has been working in a flamingo costume on the children's television series "Teleboobies", which is the reason he left the orphanage.
Relevant evidence: No