The Denney Effect 

Using the Windows OS: The Denny Effect is simply having so many windows open, it impairs your ability to properly use the computer.

Tom: Why wont this hourglass go away?!
Bob: You are experiencing The Denney Effect bud!

The Denney Effect by Derpvillage April 28, 2015

The Denny's after-effect 

After eating at Denny's, one shall feel dazed and full of greasy yummy food and ready to pop in bed.

Shortly after we ate at Denny's, most people started to feel the Denny's after-effect.

The Denny's after-effect by rofllmao18 February 9, 2009