My pm requested me to estimate few tasks on a new project(single page app), the problem was that he was creator of these tasks, so we ended up with

- Create back button
- Create next button
- Create table with contents
... etc

As I prefer to take things literally I estimated each task as they literally should (5 min for adding buttons etc). So all tasks together were estimated for about 5h, while whole project was estimated for 100MD. After few talks and discussions we ended up with:

- Create back button
- Create back button logic
- Create next button
- Create next button logic
etc