In the early days of the Internet, beginning of the 90s, the University of Cambridge probably had the first webcam on the internet. Because the staff walked to the coffee machine quite often only to find the can was left empty, someone developed a way to get pictures showing the can on the internet. This way people could check if the can was full or empty.
For those who like memories or those who have not seen it before, see these links:
A company in Denmark took this great idea and developed a management pack for SCOM 2007 R2. A webcam pointed at a coffee can makes a picture regulary. The management pack counts the number of black pixels. If the number of black pixels gets under a certain value, an alarm is shown in SCOM.
See for yourself in this very funny video:
Thanks Matt McSpirit and Sean for the tip via http://blogs.technet.com/b/mattmcspirit/archive/2010/10/28/i-thought-i-d-seen-it-all-with-system-center-operations-manager-2007-r2.aspx