Seymour Cray, the supercomputer architect, died of head and neck injuries suffered in a traffic collision in 1996. His vehicle — a Jeep Cherokee — was designed using a Cray supercomputer.
[source: "The Supermen: The Story of Seymour Cray and the Technical Wizards Behind the Supercomputer" book]
[1] http://c2.com/cgi/wiki?AppleCrayComputer