A bug that affects my teams once every few years is a developer will create a file named "A.txt" check it into Git, realize it should be "a.txt" and rename it,

A bug that affects my teams once every few years is a developer will create a file named "A.txt" check it into Git, realize it should be "a.txt" and rename it, and then basically everything will shit the bed and you waste a day figuring out why nothing is working. A related bug is a developer will make a webpage called /a/ but link to /A/ and then the link will be broken in production. At this point, I have seen this same bug enough times to be able to fix it reasonably quickly, but it definitely wastes time for the team.