idiom. A sign of a healthy, loony, batshit-worthy breakfast.
Real citation: "Any ideas? If there isn't anything like this I might write it myself or did I sprinkle too much crack on my corn flakes this morning?"
(Michael Honeyfield, Feb. 15, 2004, https://lists.dulug.duke.edu/pipermail/rpm-python-list/2004-February/000049.html)
Made-up citation: “Since insanity runs in my family, I don’t even need to put crack on my cornflakes. I got all the crack and cornflakes I need—right here!”