Heffer's encounter with a milking machine in "The Good, the Bad and the Wallaby." According to writer/director Jeff "Swampy" Marsh, the scene was originally supposed to have hearts appearing in Heffer's eyes at the climactic moment. Sure it wasn't going to make it, they described the scene to the Nickelodeon people anyway - "we described the scene, and then waited for the axe to fall, but all they said was 'can you change the hearts to stars?', we said sure, and it went in." Down the line, however, Nick rethought the decision and removed it. (thetvdb.com)