Tip - What's the Deal with Drinking Apple Cider Vinegar?

When you're stuck at home with a cold, what do you do? You might drink tea, sleep a little more, and maybe take some medicine to make the whole process go a little faster. But have you ever tried downing a glass of raw unfiltered apple cider vinegar? A couple weeks ago, my brother had a bad cold and I told him to do just that. He looked at me strangely and rightly questioned my suggestion. Honestly, I didn't have a great explanation for him. I just muttered something about having tried it based on a friend's recommendation. But have you tried this trick when you're sick, and does it actually work?