Here’s an example of how virus writers used to get their delayed giggles: Once this DOS-based malware was downloaded, it lurked until the month and date corresponded (April 4, for example, or May 5), and would then trash information in the C: disk boot sector—and then add insult to injury by playing the national anthem of what was, in 1990 when Hymn was created, the USSR. Like many early viruses, Hymn had teeth; it could render a victimized PC unbootable without special utilities.

MORE FROM THE MUSEUM: Don't touch the malware at this museum