Yeah there's nothing wrong with ET. If it was a different Katy Perry song, then I might say something, but ET is something of hers that jumps into the realm of "perfectly acceptable to enjoy". I've also heard from some fans of Katy Perry (lol) that ET is one song of hers that they do not like very much.
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ONLY FIVE CAN LADDER.
Sushi, kamikaze, fujiyama, nippon-ichi...