I remember a story about a maskil who approached the Satmar Rebbe, and who lamented the fact that Hungarian Jews don't differentiate between the samekh (ס), the sin (שׂ) and the sav (ת). The Satmar Rebbe's response was, "וכסילים מתי תשכילו" - a quote from Tehillim 94:8, meaning "O fools, when will you gain wisdom?" Brilliantly, of course, this passuk features all three of the consonants to which the maskil was referring.
I don't remember where I first heard this, but I very recently heard it again in this lecture by R' Aharon Kahn (at the 6:50 mark).
Does anybody have a printed source for this story?