If you want to scare the person who sits next to you in a flight to death do the following;

1. take out your laptop.
2. open it and turn it on
3. make sure the guy next to you is watching your screen
4. close your eyes and start mumbling as if praying.
5. open this link http://www.thecleverest.com/countdown.swf
6. open your eyes and look at his face