Hmm, what does this riff in Silverchair's Leave Me Out (1995) remind you of?
Could it be this:
Black Sabbath - Sweet Leaf (1971)
Both are great songs in my opinion and I don't mind that the influence is somewhat obvious. I think it's only natural that compositions and riffs go around from time to time.
Actually, I've always wondered how musicians come up with new compositions. They cannot know whether someone has used that particular order of notes before. They cannot be a hundred percent sure that they've come up with something original.. Isn't it a terrible feeling? I would think so. But oh well.. I don't mind the "copying", as long as it's not too cheeky...