When Capricorn has had enough, he or she will walk out. No loud words, quarrels, or physical violence. Capricorn just goes.
Getting him or her to that point isn't difficult.
Make fun of their inability to sparkle. Tell her she has a mind like a clogged sink. Ask the male Capricorn if his ability to be boring was inherited.

They cannot stand being teased. Although they enjoy jokes, they cannot tolerate being the butt of them. Practical jokes are a particular anathema. That also applies to scatological jokes. Capricorn males and females share a loathing for humor of the "bathroom" variety.

Criticize endlessly. They arbhor any kind of criticism.

Capricorn women have an especially deep love and respect for their immediate family. Insult her mother, sneer at her father, snub the kid brother.

Spend money on trivia.

Stage a lot of jealous scenes. Capricorns resent any show of possessiveness that intrudes on their highly developed sense of privacy.

Refuse to keep any sort of a schedule or program. Eat only when you're hungry, sleep only when you're tired and make love only if the spirit moves you, no matter where you happen to be or what you happen to be doing.

Try to make them live in a social whirl. Even in the best of all possible social whirls, they're miserable.

Drink so much that you have trouble putting your eyeballs back into their sockets and you continually break out into ribald song.

There's your Capricorn Goat bounding away-never to be seen again.