The clarion call in the title of this entry refers to the delicious dessert known as a
Chipwich, which sadly no longer exists in its original form.
I almost bought a Chipwich variant at CVS, but it's just not the same when (1) it is not as good as the original and (2) it isn't thrown in the general direction of your head at a high speed. (Many of the substitutes are really good, and I am sure that this one is just fine --- even though I don't think it had any chocolate chips stuck to the side --- but the mood of the moment was for the original version.) According to the Wikipedia page, the particular variant that I saw today appears to be the reason that the original Chipwich doesn't exist anymore.
For those of you who are unfamiliar with particular bits of Caltech --- or at least Lloyd House --- history from the mid to late 1990s, Chipwiches are
also the reason that I sometimes brought a baseball glove with me to Lloyd House dinners on Friday nights (and why I sat with my back to the wall on those nights, if I could possibly help it). Frozen chipwiches chucked at high speed hurt a lot if they manage to hit you. But with a baseball glove and one side protected, I was well prepared.
By the way, the clarion call was sometimes pronounced more like "Chiiiiiiiiiiipwiiich".