This is a pretty easy one liner

But we can make it a bit more complex with jquery and add a counter

It is questionable that crawlers and bots will see this so may be bad for SEO.

document.title = "A Crazy new page title. 😋";

Demo

Change the window title

function change_title(title) {
  document.title = title;
}

Demo 2

Change the window title and add a counter to it

Change the window title

Window Title: 1 :

function change_title_counter(title) {
	counter = $("#counter").html();
	counter++;
	$("#counter").html(counter);
	document.title = counter + " : " + title;
}