This is not mine, I just found it.<p>Relevant comics:
<a href="http://xkcd.com/1004/" rel="nofollow">http://xkcd.com/1004/</a>
<a href="http://xkcd.com/1031/" rel="nofollow">http://xkcd.com/1031/</a>
<a href="http://xkcd.com/1288/" rel="nofollow">http://xkcd.com/1288/</a>
<a href="http://xkcd.com/1418/" rel="nofollow">http://xkcd.com/1418/</a>
<a href="http://xkcd.com/1625/" rel="nofollow">http://xkcd.com/1625/</a>