Hidden Human Faces - I don't get it

I am the first to admit that I am no longer a very trendy person. My sheer lack of interest in technological advancements and ignorance about IPads, Kindles, smart phones, etc. makes me feel like a dinosaur at times. And I have no interest in current pop music.  (I always thought it was weird that my mom is knowledgable about music from the 60's and 70's and then sort of lost it mid-80's. But now I know why, she was probably too busy listening to Sesame Street and The Electric Company reruns.)

One current trend among some of my facebook friends is sharing pictures where you are supposed to look at the serene scene and then "find the hidden face".  Honestly, half the time I can't find the face to start with. I see comments like, "Awesome!" or "That is really cool!" but I can't see the face.

It seriously took me 5 minutes to find the face in this one. 

Other times, I can find the face and am underwhelmed. The face isn't hard to find. Or the face is creepy and I wish I hadn't found it.  Like this one...

If you can "find the face" in here, you will probably wish you couldn't. (And I am sure you can, because I found it and I don't "get it".) 

I guess this stuff is passed around because it is funny? Or because people like the accomplishment of finding something that is hidden? Sort of like the glee Little Man feels when he opens his big garbage truck and finds the matchbox cars he put in there last night before bed? I guess that would only work if you were the one that put the guy's face under the leaves though.