Konqueror on Big Bang Theory

Years ago I read something about one episode of The Big Bang Thoery showing a t-shirt related to KDE, but I do not remember what, when and who.
Since I’m now watching, in my spare time, the series again, I started searching that image, and I found: it was a clear mention to Konqueror, the catch-all web browser of the time for the KDE desktop (if I remember right, at that time I was using KDE 4).
Apparently, there is no other great major t-shirt appearing on the show (I searched for Emacs, Firefox, Eclipse, Linux, and so on).