Hiddden message in credits

This subject comes up in discussions of various Mystery episodes, but I'm posting here in the hopes that people will come across it and become aware. I don't know how long it's been going on, but in the closing credits, several letters will appear in red, and they will spell out a hidden message.

The new Sherlock episodes had this, and so did the recent Inspector Lewises. Here are excerpts from posts about the latter:

LCShackley (Wed Sep 28 2011 13:32:48) "I have been involved in other threads about the "secret messages" hidden in the rolling credits at the end of MYSTERY. (Look for the red letters as the credits roll by.) Usually they have some cryptic reference to the plot. For instance, one recent LEWIS episode had the message "sprung rhythm" - a reference to poet Gerard Manley Hopkins, who was quoted in the script."

printphi (Tue Oct 11 2011 23:14:31)"I'm very excited that, after going back and looking at the closing credits about 200 times, I more or less figured out the secret message. I can't read every letter, but it's the Irish Gaelic for knife box: skean/sgian bosca."

Warning: They may be easier to see on some TVs than on others. I also find that they're more clear in some episodes than in others.

Enjoy the puzzles!