Ben Doherty (Oomph, Inc)

Specify a list of tags to keep hidden: These tags will be invisible to users, 
such as in tag clouds or in post tags lists. This is useful when using tags to 
control behavior of your blog, or when you wish to maintain groupings of posts 
out of the public eye.
This does not prevent tag archives for hidden tags from being accessible, only 
hides tag links from tag lists and tag clouds.
Capable users (with the see_hidden_tags capability,) can see hidden tags in 
tag lists (but NOT tag clouds.) Hidden tags will receive the .hidden-tag class 
and are grayed out by default.

Oomph Hidden Tags

Hide certain tags from tag lists and tag clouds. Allow capable users to see hidden tags with the see_hidden_tags capability.

Joseph Bisharat

Trigger an image to slide across your browser screen to your desired tune by entering the correct secret code on your keyboard.
You could keep this easter egg a secret and let users find out about this hidden gem on their own, or you could prank someone’s computer by turning their volume all the way up and ask them to enter in the code.
The choice is yours!
Accepted image types: .JPG, .JPEG, .PNG 
Accepted tune types: .MP3
<h3>Attribution</h3>
<ul>
<li>Thank you <a href="https://zurb.com/playground/jquery-raptorize" title="Zurb Raptorize" rel="nofollow ugc">Zurb</a>, for showing me that no matter how dull and boring web development may seem, it’s the little joys in life that uhh….find a way. ;D</li>
<li>Thanks to my family for pushing me to do more, to be more, and to achieve more. </li>
<li>And here’s to you, WordPress Users, for installing my plugin. I hope you like it.</li>
</ul>
<h3>Design</h3>
Artwork by <a href="https://www.candiceallenart.com" title="Candice Allen Art" rel="nofollow ugc">Candice Allen</a>

Secret Image Slide and Tune

Enter the secret code in the proper sequence to set off an image that will slide across your browser screen along with the tune of your favorite sound …

Oomph Hidden Tags vs Secret Image Slide and Tune