But on the other hand I don't appreciate it one little bit. It took me years as a kid to figure out that the 'tsk tsk' expression I used to read in Disney comics was not pronounced 'tsk tsk' at all, but was in fact that familiar fricative. How on earth and why on earth did that 'k' get in there, Tskuwm?

Huh? How else does one say that? I have always heard it as tsk avec the k.