When you have a technical problem you can't fix, but when you try to demonstrate it to an expert, it magically goes away, leaving you looking dumb.
"My PC was bluescreening all day, whenever I moved my mouse, but when I tried to show the IT guy what was happening, it worked fine and it hasn't happened again. Total Guru Effect."
by Garignak December 13, 2014
Get the guru effect mug.