When is it Numberwang?

"That's Numberwang!" is a random message displayed 10% of the time during score update if your score for that turn is greater than 8:

The relevant code is in html_actuator.js:

function HTMLActuator() {
    ...
    this.thatsNumberwang  = document.querySelector(".thats-numberwang");
    ...
}
...
HTMLActuator.prototype.updateScore = function (score) {
    ...
    if (Math.random() > 0.9 && score > 8) {
        this.showMessage()
    }
    ...
};
...
HTMLActuator.prototype.showMessage = function (message) {
    message = message || "That's Numberwang!";
    var announce = document.createElement("p");
    announce.classList.add("show-numberwang");
    announce.textContent = message;
    this.thatsNumberwang.appendChild(announce);
};

Every turn the site contacts Colosson to determine whether or not it is Numberwang. The result is relayed safely back to the user, to avoid further incident.