I know it's petty of me, but it annoys me to no end when people label a tab in Excel "Summary" when it's actually a table of contents. Then they link all the other tabs to it (because it's a table of contents) so there's no way to rename it without breaking all the hyperlinks.
@CarrieLikesCoffee My Excel annoyance is people leaving extra tabs at the bottom because Excel created them as a default. They use only one sheet but leave Sheet2, Sheet3, etc. They also don't rename Sheet1.
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@WordsmithFL See also: Empty folders on a drive named "New Folder" followed by whatever number of empty new folders there are.