Sometimes you (read: I) find a nice ball of yarn in a shop and you just want to have it because it reminds you of a watermelon. Then you wonder what you will do with a ball of very thick yarn in a colour scheme that reminds you of a watermelon. At that point ravelry came around the corner again. I found the Swirly Smooshy Chunky Beanie, which would require only one ball of yarn. So I cast on one night, size 9 needles and I finished the knitting that night. A very quick project indeed. It took a few weeks more to actually finish the project and add a little fluff ball to the top with the leftover yarn. In effect there is only about 6 cm of yarn that have not been used.
Another one night project was a little doggy with its tongue stuck out that I knit while staying with my parents. It found a new home as a present but it was quite fun to see if it would work. I think it did.