What's the worst coding practices you have seen(or done!)?

RE:

My teacher! Not only was it in Danish, it was also ridiculous. Here is the (english) translated version:

/**
 * Determine kids gender.
 */
public isBoy() {
  if (this.isBoy) {
    return true;
  }
  else {
    return false;
  }
}

I also had another teacher who started out, when he for the first time showed us his code, by saying "this is a little messed and now how you should do it" – he had put all 5-10 classes of the application in the same single file.

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