Insanity runs in my family. It practically gallops.

The line is a piece of self-deprecating wit: it takes the familiar expression “runs in my family” (usually said of traits or illnesses) and heightens it with the comic escalation “it practically gallops.” The humor depends on exaggeration and on the contrast between a grave subject (mental illness) and a breezy, almost athletic metaphor. In quotation culture it functions as a polished one-liner that reinforces Cary Grant’s public persona—urbane, fast, and effortlessly funny—while also hinting at the way families can normalize or inherit patterns of instability. Even when used casually, it can be read as a coping joke: laughter as a way to acknowledge anxiety without being overwhelmed by it.