Nothing SPECIAI about breakfast in Park Slope, Brooklyn, except when it's at the Grand Canyon, and it's served with a side of improperly used lowercase L's. This is another perfect example, in which the only lowercase letter is the L, and it is the same height as all the other letters in the word, including an uppercase i. You can see that the author clearly knows how to use an uppercase L, as in the LUNCH SPECIAL, but he ends up scribbling some sort of hybrid upper-lowercase L for the DINNER SPECIAl.
Interestingly, when I first noticed this sign in passing, it was clean and unmarked by smudges. But by the time I returned with my buddy Berger and his camera, apparently someone kicked the sign in the upper left corner, undoubtedly outraged by the lowercase L. Either that or the Coffe & Jucie.