Oh man, I have so many. There is Goku burrying Vegeta in the Freiza Saga. Goku teleporting Cell to King Kai's Planet, and he talks to Gohan telling him he is proud and all that stuff. Gohan's transformation to SSJ2. Vegeta's quote vs fat Buu, "You are a fool. I am going to crush you and throw you into the wind." Then when he kills himself. Ya, I have to agree that Mystic Gohan beating down Buu is cool too. And last but not least, probably all Goku's major SSJ3 transformations (the first one, then the demonstration to Goten and Trunks, then the first one against Kid Buu).