Here are some examples that I have posted about in the past:
My version: Cheap lumber and paint stir sticks for $8
it is currently listed for $159!)
My version: Leftover Bead Board $5
My Version (from Oddity Inc): $37
But it just did.
Yesterday I posted about my Memorial Day mantle, which featured an old Stars and Stripes burlap banner that I made back in June of 2012.
Huh? That looks familar!
A BURLAP STARS AND STRIPES BANNER?!
And it is a pretty close replica to mine. Burlap triangles with the exact same patterns, all strung on a piece of sisal twine. (They sewed a sleeve on theirs and mine are just strung on through holes in the burlap.)
Their version: $23.50
My version: Maybe.. eh.. $1?
Now I'm not implying I was 'wronged' by Pottery Barn, the way Target screwed Mandi. The chances of us coming up with the same idea independently is very high. (Since stars and stripes on pennants and burlap style banners are both every common.) Plus there are tons of similar styles of this same banner floating around. Here is an example from PlowHearth:
But clearly I'm ahead of my time, since now I'm designing Pottery Barn knock-offs before Pottery Barn even designs the original!