This is a truly simple prank in which you capture the whole screen with PrtSc key (for print screen - located close to the numerical pad), then save the image, and then set it as a windows "wallpaper", and finally, you turn the icons off so they are hidden. When the owner of the computer comes back to it, he or she finds that nothing happens even when they click on what they think are icons on their desktop.

In this prank, a fake floor with a pool of mud below has been put in the jogging path of a park.  This prank required heavy equipment so that the pool could had been made over night.  People jogging would fall in the water that just looked like their typical jogging path.  Notice people are dressed for cold climate so that must have been very cold water. 

In this prank, a public bathroom has been modified so that both halfs look exactly the same, and a glass has been fitted between the two sections.  A pair of twins has been trained to act and respond exactly in the same way to people who fall in the prank.  When somebody enters the bathroom, and looks through the glass, only sees the twin on the other side, and cannot see him or herself reflected in the fake mirror of course.  The prank is so mind buggling that even thought the twins are females, a guy that entered the bathroom had more interest on the fact of the fake mirror and his reflection not being there that forgot somebody should had been in the wrong restroom.