Ok ok, maybe it´s not the world´s most effective landing page but let me show you something today and you will understand why I chose this title.
As you can imagine it´s about a landing page.
To be more precise, it´s about a landing page style that I often use.
To be even more precise, I don´t even know if it can be called landing page because in the end it´s so minimalistic that it isn´t even a real landing page but see yourself:

Yup, that´s it.
As you can see, it´s just a simple JS alert and that´s all.
When the user clicks on "Ok" he gets redirected to the offer.
Of course that "LP" won´t work for all offers but I use it alot and for the offers where it works (hint: click2call and click2sms) it has lots of advantages.
It´s very easy to create, it basically takes only a minute to create such LPs from scratch.
I also like to use it as multi-language versions, you can find a tutorial how to create multi-language LPs HERE.
Instead of text for the LP you just set the title, then a blank line and then the text for the JS alert.
There are quite a few offers that also work direct linked but often I still use that LP, especially on pop traffic.
The reason is that a JS alert will bring your landing page on mobile devices to the foreground, even when it´s popunder traffic.
So just by using this little LP your campaigns can receive much more attention.
It can also speed up things when you want to run few quick and dirty tests without having to mess around with editing more complicated landing pages.
Here is the code for these LPs and you will see that it´s very easy to use:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<title>Title</title>
<style>
body {
background: #fff;
}
</style>
<script>
function getURLParameter(name) {
return decodeURI(
(RegExp(name + '=' + '(.+?)(&|$)').exec(location.search)||[,null])[1] || ''
);
}
</script>
<script language="javascript" type="text/javascript">
alert("Introduction\n\nSome text, instructions or so\n\nCall to action");</script>
<meta http-equiv="refresh" content="0; url=https://Your_Click_URL">
</head>
<body>
<script type="text/javascript">
window.location = "https://Your_Click_URL";
</script>
</body>
</html>
<script>
function getURLParameter(name) {
return decodeURI(
(RegExp(name + '=' + '(.+?)(&|$)').exec(location.search)||[,null])[1] || ''
);
}
" + (getURLParameter('PARAMETER_NAME')) +"
<script language="javascript" type="text/javascript">
alert("Introduction\n\nSome text, instructions or so.\n\nCall to action");</script>
<meta http-equiv="refresh" content="0; url=https://Your_Click_URL">
<script type="text/javascript"> window.location = "https://Your_Click_URL"; </script>
Thanks for sharing. Running a similar type of lander but with 2-3 pages of that style, on push and sms with great results.
One alert then the call to action goes to a normal index.php but it looks as simple as your page. The button on index1/index2 only says 'continue' with an image above and 2 lines of text above. Very simple = very effecctive.
The last 'continue' ends up on the offer page of course.
Good share, this style is bread and butter of push & pop traffic and back in days used to work really well on ppv, Just needs a little creativity and one can do tons of this with this style 
Absolute Gold!! Never thought of this and I thought I knew everything lol.... I use simple one page Landers as well for my social traffic. But this is definitely brilliant... I think with some creativity this could work for my niche on FB. Question, do you think it would work in the parenting niche?
Landers like this can perform really well with simple flows, I've done a ton of money with something similar when PIN submits were hot in India... a bit teasing image of a hot female and the guys would click and convert like mad 
Thanks for sharing!
I can confirm that the JS popup can help conversions sometimes. Test them on their own or as an addition to your best lander and see which converts best.
Disclaimer here is that using JUST the popup alone is often not enough to convert anything with complicated flow - it can be a quick and dirty test only for offers with easy flow and/or small payouts.
Amy