Yup 1st trip is to get what you thought you needed
2nd trip to get what you forgot
3rd tip to get what you really needed.
This was so me. My personal record is five trips to Lowe's in one day. Now if I have a project, I will get two or three of the size I think I need, two or three of the next size larger and two or three of the next size smaller. Then I return the stuff I didn't need the next time I'm out. I learned this the hard way, you guys can have it for free!