So many songs have been written about laughing though tears; smile, though your heart is breaking, etc. How about a few about the fun of laughter? Can't think of too many just now. Maybe you can. Let me know!
I've heard compliants about jokes people share on Facebook. Sure, it might get to be too much at times, but you have to admit, a smile or a laugh is far better to skim over than misery, complaint or dismal news.