From a list of inaccurate predictions:

Robert Metcalfe is the founder of the 3Com digital electronics company and a professor at The University of Texas at Austin. He holds a PhD from Harvard, is the co-inventor of Ethernet , and holds a Grace Murray Hopper Award for developing it. Today he is a General Partner at Polaris Venture Partners, a venture capital firm that specializes in early investments in technology companies.

Despite his impressive resume, Robert Metcalfe is known for at least one inaccurate prediction that he is unlikely to live down. In a 1995 issue of InfoWorld, he famously said of the Internet that it "will soon go spectacularly supernova and in 1996 catastrophically collapse." He then promised to eat his words if proven wrong. He was. So during his keynote speech at the WWW International Conference in 1997, he produced the magazine page containing the quote, put it in a blender, and ingested it before a live audience.
 
http://www.cnbc.com/id/43094187?slide=11