I realized the problem with ToDo lists in High School. I was reading the Harry Potter books back then and I was loving it. I couldn't stop reading and still I can't count how many days I "lost" because I spent the whole afternoon and evening reading the book. Then, my English teacher allowed us to choose any book from the library to read for the test at the end of the trimester. I thought "Hooray, I will read the next Harry Potter book". The thing is, because it became an obligation to read the book, I couldn't spend more than 1 hour reading the book. It instantly became boring. And that is the effect that we have over ToDo lists. The list keeps remind us of our obligations and take all the joy from our lives.