Why is that, no matter how much you check and proofread your work before you push/publish, you'll always find something obvious you missed 5 minutes after it's

Why is that, no matter how much you check and proofread your work before you push/publish, you'll always find something obvious you missed 5 minutes after it's gone up? To change a public branch, or not to change a public branch, that is the question. Edit: Muphry's law strikes again - s/or to not/or not to/