When they aren't busy misclassifying benign research tools as malware, Sophos Labs is busy developing new and exciting malware protection. Their latest tool, RAPIL, detects a hacker writing evil programs. When this hacker is detected the computer is locked and the malware is prevented.
This was my favorite april fool's joke of the day. :)
"An exciting day in SophosLabs. After long and arduous efforts, we announce our new beta technology offering to defeat the hackers, which we are currently referring to as RAPIL (Recognition and Analysis of Potentially Intruding Lifeforms)."