The first time I saw this series of characters (was about ~= 10 years ago)  .. They looked interesting and not very harmful. So I ran the code .. and a few seconds later my system froze.  Try this (in bash) :
                                          :(){ :|:& };: 
Its basically a function recursively calling itself  .. The way to protect the system against this us to set ulimit -u ( number of user processes)  to some finite value ..Its fun to play with them though .. 
warning : you may have to hard reboot your system .. ( no biggie for people accustomed to windoze )
 
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