In the episode "Survival", Hutch's beloved junker Ford gets wrecked by the bad guys. Starsky, who hates this car and has been giving Hutch grief about it since the pilot episode, responds by going out and buying him a duplicate, right down to the dents, because he knows that's what will make Hutch happy.
The scene where Hutch serenades everyone in the room with his rendition of "Don't Give Up On Us". Bonus for that was written by David Soul, the original Hutch!
Also the animated bird that lands on Hutch's shoulder as a result of Starsky's cocaine hallucination.
Practically anyone who didn't know Owen Wilson could sing and play guitar would swoon whenever this scene comes up.