I had an epiphany a while back, but life ensued and I was not able to type it up. It's kind of random, but whatevs.
In the Torah, there is that bit that if you see the donkey of someone you hate struggling with its burden, you are supposed to help the hated one, even if your best bud who is standing next to him could use a hand.
Sometimes the Torah gives us the means to be the most annoying.
If you can't stand someone (and we assume the feeling is mutual), the one thing they do not want from you is a favor. It makes them choke to be beholden to someone they don't like.
Let us say (and I am totally not speaking from experience, cough cough) there is a shadchan who drives you mad. Your profile needs constant editing (according to her), your pictures are no good (according to her), and for all that nitpicking, her shidduch suggestions are waaaaay off base.
It would aggravate me to no end if she would end up being my shadchan.
So: Help out the guy with whom you have a feud. Because that'll make him want to explode. Win-win.