<p>Nah, these are the rounded/curved ones where there&#39;s a surface for turning the screew one direction, but nothing for the other.</p>
<p>By that I mean these:<br>
 <a href="http://en.wikipedia.org/w/index.php?title=List_of_screw_drives#One-way">http://en.wikipedia.org/w/index.php?title=List_of_screw_drives#One-way</a></p>
<p>I&#39;ve seen in restroom stalls and a &quot;secure door&quot; facing the outside world.</p>
<div class="gmail_quote">On Nov 28, 2011 12:06 PM, &quot;Jonathan Foote&quot; &lt;<a href="mailto:jtfoote@ieee.org" target="_blank">jtfoote@ieee.org</a>&gt; wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

On Mon, Nov 28, 2011 at 8:12 AM, Erik Nelson &lt;<a href="mailto:erik.nels0n99@gmail.com" target="_blank">erik.nels0n99@gmail.com</a>&gt; wrote:<br>
&gt; There are those infernal security screws that won&#39;t unscrew with a<br>
&gt; screwdriver.. But I really hate those.<br>
<br>
That&#39;s likely because you don&#39;t have enough bits.<br>
Voila:<a href="http://www.sciplus.com/singleItem.cfm/terms/11236" target="_blank">http://www.sciplus.com/singleItem.cfm/terms/11236</a><br>
<br>
The rare ones with the ratchet-like unscrew prevention are easily<br>
handled with vise grips or screw extractors.<br>
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</blockquote></div>