$ wget -O - http://placekitten.com/$[500 + RANDOM % 500] | lp
July 26, 2013, 11:43 p.m.
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openiduser104
Explanation
$RANDOM gives a random number.
http://placekitten.com is your cat place
wget -O - sends the output to stdout
lp prints
Limitations
Tested on OSX
Cat rules