"Knock Knock Knockin' on Jackson's Head" is the eleventh episode of the third season of the Disney Channel series Hannah Montana and the sixty-sixth episode of the series overall. It aired on March 22, 2009. It was written by Andrew Green and directed by Rich Correll. The title of this episode is a reference to "Knockin' on Heaven's Door" by Bob Dylan.
After Miley and Jackson get into an argument with Miley's pantyhose, she ends up making him hit his head, causing Jackson to suffer temporary amnesia. Miley uses this as an opportunity to get Jackson to be nice to her, so she tricks Jackson into thinking that he was always nice to her. But after a while of him be way to over-protective towards her, Miley misses Jackson's old ways, and tries to provoke him to be mean again. Miley finds out that Jackson was faking it and that Robby was in on it as well to teach Miley that she really loves her brother the way he is. Meanwhile Lilly reluctantly pretends to be Rico's girlfriend so he can help her with her Algebra when his competitive cousin Alejandro (Angus) (Moisés Arias) visits from Australia. At the end, Lilly and Barbie (Angus' girlfriend) tell each other that they are faking to date the boys. Barbie is pretending because Angus promised her to tutor Spanish and Lilly wants a math tutor. The two are good at the subject the other is not doing well in so decided to tutor each other, leaving Rico and Angus fighting.