1. The Bluth's pets.
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    GOB's many, many, many dead animals for his illusions, Buster's turtle. You do not want want to let this family buy an animal from your pet store.
  2. Never nude.
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    There are literally dozens of him! Most famous being Zach Braff.
  3. Anne Veal.
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  4. Banners
    They love their banners, and they love reusing them with bad changes, and they especially love not using proper grammar.
  5. Annyong
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    Lucille's adopted son, who everyone thinks is named Annyong, but that's actually how you say hello in Korean. His real name? "Hello". I suspect they purposely chose Annyong because it is close to the word annoying, as many members of the family get annoyed with Annyong saying what they think is his name for seemingly no reason. Thanks to @wmf for reminding me about this one!
  6. Chicken Dance.
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    GOB's go to insult. Especially funny once the whole family starts doing it.
  7. Buster's hand, or lack thereof.
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    They start dropping hints about Buster loosing his hand during the first episode of season two, where the TV in the background is talking about a seal attack. Literally, there are clues all over the second season, if you're looking for them. Also, the blurring of his hand gets me every time.
  8. The Man Inside of Tobias Fünke.
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    "I'm afraid I just blue myself." "Who wants a banger in the mouth?" "I'm afraid I prematurely blue myself on what was supposed to be a dry run, and now I have somewhat of a mess on my hands." "Leather Daddy." "ANUSTART." "ANALRAPIST."