Another reason to use https (though I guess IT can install a cert for transparent MITM SSL proxying). Imagine a user whose TCP connection shuts down as soon as the 4 bytes 'fuck' pass it (say, only for port 80). This should happen randomly for high-entropy binary (e.g. compressed text/image) data - about 1 in 4 billion bytes. I guess it's not that likely except for extremely large files.