More to explore:
I didn't know this.
Omg why didn't I know this before??
A New World! Omg why didn't anyone tell me!!!?
SO SMART! I need this for my house! Why didn't I think of this!!
You Probably Didn’t Know You Had These
Why didn't I think of this!?!?
Things You Didn't Know About Sleep
Pinstrosity -- A blog where people submit Pinterest projects that didn't turn out as planned. I love how they tell you why it didn't work and what you need to fix.
Not sure if I believe this, but it's worth a try