When I see things like this on the 'Net, I am trapped in that sad space between tears and laughter. 

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <soap:Body>
           <unsignedByte>C4<unsignedByte>
    </soap:Body>
</soap:Envelope>

Update: Someone who reads my blog chatted me thinking that the hex contained within (0xC4) represented C4 Plastic Explosive.  Whoa...NOT.  I was just wallowing in the overhead of the SOAP Envelope, the unused namespaces, the UTF-8 encoding, not to mention HTTP, etc, being used to transmit a single byte. That's all. No hidden message. :)