My big problem is that TeamFourStar's DBZ Abridged has overwritten many of my memories of the original, so my brain spits out several DBZ Abridged favorites, and I remember that the original scenes were not my faves. ^_^'
That said, my favorite (TFS scene) is Piccolo overhearing the exchange between Future Trunks and Goku.
...or any scene where Yamcha gets Yamcha'd.