You'll notice you mentioned kicking ass first and chewing bubbleguum second, like the Duke version does, whereas the They Live version mentions chewing bubblegum first and kicking ass second.
Not every disagreement is worth arguing about, no one is wrong here because on the one hand what you said (and what Sterben said too) is more like Duke's version because you said it in the same order that Duke does, but on the other hand yours was closer to the original because you said "came here to" instead of "it's time to".
Not every disagreement is worth arguing about, no one is wrong here because on the one hand what you said (and what Sterben said too) is more like Duke's version because you said it in the same order that Duke does, but on the other hand yours was closer to the original because you said "came here to" instead of "it's time to".