JavaScript not running properly.

When you use the || operator you are not adding values to the first condition, you are adding separate independent conditions, meaning that all of the conditions you supply need to be meaningful enough that they could be used on their own. "five" is not by itself a very meaningful condition as it doesn't actually compare the string to anything, but it will evaluate to true due to the way JavaScript converts non-empty strings to booleans.

In addition to that you have another issue in your code, you have forgotten to add parentheses after the toLowerCase method. When you don't use parenthesis after a method in JavaScript you won't actually call the method, but instead just reference it, which is not what you want in your solution.

If you add the parenthesis and make the second condition one that is meaningful on it's own like this:

var score = 0;
var answer1 = prompt("How many Super Bowls have the Dallas Cowboys won?");
  if (answer1.toLowerCase() === "5" || answer1.toLowerCase() === "five") {
    score += 1
  }
alert(score);

Then your code will work.