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.
So when I need to add an actual summary, my choice is to either break & fix all the hyperlinks to the TABLE OF CONTENTS or call my new tab something asinine like "Summary Tab"
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I also realize my whining will only mean something to a small subset of people who, like me, spend waaaayyy too much of their day working in spreadsheets.