Kna's last because of the story about someone dangling a picture of some doves in front of his face at the end because he absolutely couldn't conduct it unless he saw a dove. Also because of the extraordinary way Vickers does the final sill syllable of "Enthüllet den Gral! - Öffnet den Schrein!" in the last act at the end, introducing a long imaginative diminuendo which blends with the orchestra magically.
The Syberberg film because it needs that sort of thing to spice it up. I especially like the androgynous stuff because I do.
Goodall because I saw him do it on a disastrous night in London, when Parsifal's costume started to fall apart in the last act, and he wondered around the stage singing dragging around stuff from his armour . Embarrassing for audience and no doubt for singer (Siegfried Jerusalem) So the recording always makes me think of that.
Karajan because of the unforgettable sight of Peter Hoffman almost naked in the second act in Covent Garden, the most sexy thing I've seen in an opera apart from some S and M style Verdi in Berlin.