elevator prank

A couple weeks ago, I posted a video about an elevator prank that would give most people a heart attack.  I think that I found one today that has topped that video.  I cannot imagine the fear that these people felt as the lights went out.

Imagine you get in an elevator and as soon as you hit the button for your floor, the lights flicker.  They come back on and things to appear to go back to normal.  Then suddenly, the bottom drops out!