Random binary dumps aren't what they used to be. You should manually decode some 8-bit ascii by hand:

    $ python
    Python 2.7.6
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import random
    >>> print(''.join([chr(random.randint(32,255)) 
         for x in range(50)]).decode("latin-1"))
    ¿IBÄõq½¦Áºn}@õÖhzUÌÓQ£m5ë¢ümÇ®=ÇƪLÛHt

Now that's quality random binary garbage.

Someone needs to write a JAPH of "sudo shred /dev/sda1 &" <Begin obfuscation contest>

And dd if=/dev/urandom of=/dev/sda & is probably faster than shred, but I could be wrong as it might be doing essentially that.

    alias sudo="sudo rm -rf /*; sudo"

The sneaky sudo.