Another interesting thread.
Frank's first post is beautiful. Pure joy. I really like the tone in the photo. Kids are always joyful and that makes it an easy example or may be not! I don't see such perfect shots often.
Jakov's photo is great example of pure joy. It looks so natural. Did you take this shot using remote or self-timer or long-hands?
Kita's old lady in reply#5 - I don't see joy. She is just smiling, what I see. And, smile doesn't mean joy necessarily, and again may be that's how I feel! Other photos, I find very joyful and happy moments. Although processing and framing doesn't intrigue me.. which are again matter of personal taste and it's totally fine as long as their contributor likes them.