I have sort of a love-hate thing going on with William Wegman's bits.
On the one hand, they were very, very prominent during the early 90s, which are some of my earliest memories of watching SS as a wee liddle laddie, so there's definitely a nostalgia factor to them for me; on the other hand, some of them could be a tad unnerving to look at, particulary the ones where Fay-Ray and the other dogs' heads were used on top of human bodies.
Oh, and one in particular with Fay-Ray dressing up as those different animals (like Kermit the Dog): the dark backgrounds, and those freaky-looking costumes were something you couldn't look at, but you also couldn't look away.