These are obviously ineffective, but her line of reasoning had some sense: snails tend to be general Squick in anime (it's used in other anime too, usually with negative connotations), and she probably figured a car lover like Keiichi would react at the destruction of even their likenesses. In one episode, Sayoko tries to extract Belldandy's secret from Keiichi by letting snails crawl on his chest and smashing toy cars with a hammer.
Needless to say, Skuld was wailing at the whole 'spectacle'. A later episode has Urd go further by forcing Skuld to look at a whole table full of useless machines just moving around after the latter committed a graver offense.Skuld: Noooo! Don't make me create robots that don't do anything useful! Pleeeeeease! Urd: Good, good! Now make a robot that does nothing but go around in circles!
