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Some people when upset may push away, but this is okay too. A warm arm around someone can brighten their day. Not all of us are Julia Child, Carrot Top (...), or Bob Ross. But most of us do have something we're good at. Whatever it is, use it to cheer up your friend. Can you cook a mean lasagna? Fantastic -- it's dinner time somewhere. Can you reel off jokes like word play is a skill taught in kindergarten? Can you paint a mean shed on the side of an ethereal-looking mountain? Great. These skills can also be happy-making skills. Use your creativity and finesse to tackle their blues. Sing them a song at the top of your lungs. Take them along on a hike. Force your kitten on them. What's in your tool belt of skills? Employ them. Look on the sunny side of life. Focus on the half-full, not the half-empty. Being optimistic is a mindset, and it can be infectious if used in the right way. Be on the lookout for interesting, exciting, or uplifting opportunities that your friend might have overlooked while they were busy being pessimistic. There's almost always a silver lining to a problem. We sometimes don't want to look at it, but it's usually there. Here are a few ways to think about some common problems in a more positive manner:  My partner/significant other broke up with me. "Don't worry about someone who doesn't value you completely as a person. If s/he doesn't get how special you are, they probably don't deserve you. There are plenty of other eligible people out there who will."  Someone in my family/social circle died. "Death is natural by-product of life. While you can't bring the person back, you can celebrate how much they affected your life, and perhaps how much you changed theirs. Be grateful for the time you did get to spend with them."  I lost my job. "Your job is an important reflection of who you are, but it's not the whole picture. Think of the lessons you learned while at your job, and try to find ways to apply them to your next job in the future. Finding a job is all about working harder than everyone else. Be motivated to show employers how much more qualified you are than everyone else."  I don't have confidence in myself. "You have so much to be confident about. Everyone has strengths and weaknesses; it's what makes us unique and beautiful. I like you just the way you are. I don't see any reason why you shouldn't have just as much confidence as the person next door."  I don't know what's wrong, I just know I feel bad. "It's okay to feel blue. Our happy moments are made even brighter by the darker ones. Don't force it if you don't feel like it, but think of how lucky you are compared to other people. That always manages to help me." . If you are down in the dumps, how are you going to cheer up your friend? Strike a good balance between concerned — you want them to know that you're not happy that they're not happy — and optimistic — being a happy-go-lucky, glass-half-full kind of person. It's a lot of work, and it can be emotionally grinding, but your friend is worth it, right?  Help them out and do as much as you can for them, so they still know that someone cares. This builds trust. They know they can rely on you. Do this, always, with a smile. Offer to take their mind off of it with an activity, like going to the movies, going on a hike, swimming, or gaming. If they don't want to be distracted, don't pester them about it: You can't help people who don't want to help themselves. Stay happy, stay dedicated, and stay available until they want to sort things out or forget about it. There are some people in the world who will benefit more from a day of sadness than others -- to those, it offers time for reflection, self-analysis, and refueling. Your friend may just need a bit to gather their woes and get back at it. If s/he requests this, respect it. It's not your duty to fix them. In time, they'll fix themselves. And yet there are times when people should be sad. It's not logical to expect a girl whose father died three months ago to all of a sudden snap out of it. Each person is different and their timeline of grief is as unique to them as their fingerprints. If they're still grieving from an event, the only thing you can do is stay by their side. That speaks for itself.

Summary:
Give them a big hug, if they are okay with the contact. Play to your strengths. Be optimistic. Don't be sad yourself Know that sometimes people need to be sad.