Knock Knock Knockin' on Jackson's Head is the 11th episode of the Thirth season. The title of this episode is a refrence to' Knockin on heavens door' by Bob Dylan.
Plot
After being hit on his head, Jackson suffers amnesia and Miley tricks him into believing that he praises her. When Jackson starts to repel cute boys from Miley, she changes her mind and tries to bring him back real memories. Only after she says she misses the old Jackson, he reveals that the amnesia was fake and that he and dad have tricked Miley. In the end Miley and Jackson forgive each other.
On the beach, Rico convinces Lilly to act like his girlfriend because his cousin, Angus, is visiting him, in exchange for math lessons. Angus comes with a fake girlfriend named Barbie and starts to fight with Rico, during which Lilly and Barbie suggest giving lessons to each other (The other girl is good at math but needs to get better in Spanish which Lilly is good at). In the end, Lilly and Barbie become friends.
Trivia
- The answer given to the math question is in fact the square root of 69.