While opening a file that was there when I readdir()'d a second ago:

open (FILE, $file) or die "HEY! Where'd $file go? $!";
[download]

A little off topic, but another favorite log message - this app communicates with a child process via an open2() mechanism. If they get out of sync, bad things happen. I found they can get out of sync when the child is reporting back an error condition, so as a hack to guard against it, I just kill the child, causing a new one to be spawned when I need it next. The logged message was:

Killing my child for reporting an error - call DYFS

A few people have noticed that one in the logs. :-)

Peace,
-McD