As a FreeBSD guy (and even on my Linux boxes) I've been using tcsh as my shell for years, but I never noticed this easter egg before. If you have your prompt defined to show the time with
%T, at the top of each hour (as my American friends say it) it replaces the time with the word "
DING!", how cute!
Chan-andler Bing Ding! Ring a Ding Ding, it's a new hour! Is it sad that something like this made my day?