I remember a similar bug in the early 1980s when a line-of-business system went haywire every Wednesday. Every other day it worked fine.<p>We eventually found a maintenance programmer had changed &quot;Wensday&quot; in a database to &quot;Wednesday&quot;. Unfortunately this was passed to a C char day[9], so the string had no trailing &#x27;\0&#x27;. Hilarity ensued.