How to use "ruin" in a sentence

If a minority in such case will secede rather than acquiesce, they make a precedent which in turn will divide and ruin them; for a minority of their own will secede from them whenever a majority refuses to be controlled by such minority

I just thought you might be annoyed with me, and I didn't want to ruin our day."

"You've got something else in mind, and shooting me would ruin it."

'Not out of my sister's ruin.'

'Ruin, ruin, ruin! Christ! See, Connie, the funny thing is that I am sure you are the only person who thought it was a disaster to have a sister who was the girlfriend of a big man.'