A mother takes her sick child to the doctor. Who, after careful investigation, concludes the child has a 'virus infection'.
The kid is offended and shouts: "But Doctor! I am not a computer!"
Based on a true story, as seen on TV (scroll to 26:50). Thanks Jorrit. See also: Computer crash virus, Hurricane$ approaching, meet the worms, viruses and trojans, Your grand-grand parents new media.