I tend to not finish things that I start.
I'll do things like move a whole room of furniture around and give up half way.
I just get bored very easily, I guess. I do this a lot with my Zazzle store. I'll start making lines of products with a set of photographs I just took. I'll get through completing the first few just fine. By the time I get to my fourth one or so I get bored and move onto another photo before finishing with the one I started.
Hopefully I can finish this 30 days. :)