For awhile, I was quite content to knit scarves and dish cloths (in other words, squares and rectangles). Then I discovered Stitch 'n' Bitch and was so excited to knit a hat with kitty ears on it! I really had no idea how to read a pattern, and hat never even knitted in the round before, so I got through the beginning part just fine, then completely misunderstood the instructions and went from knitting the first 2 inches of the hat to decreasing. I left out the whole middle of the hat!!!! I pretty much had a knitted yarmulke. I went ahead and finished it, it was good practice for decreasing, and I still have it. My mom and aunt got a good laugh at it, and so did I once I got over feeling like a complete arse!!!
I wasn't too discouraged, and went on to knit a half dozen kitty and devil hats (and one based on that pattern that looks like an old pilot's helmet with goggles) that turned out just fine!