Normally, when you double-click a cell, you enter in-cell editing mode, right? This works most of the time, but occasionally on random cells, a double-click instead moves the focus to a different cell in the sheet, as if I had simply single-clicked that other cell. If I then double-click the original cell again, it works as expected: I can edit the contents of that cell and everything is normal.
This happens on random cells, regardless what their contents are, and of course they're not hyperlinked or anything like that. It happens on several versions of Excel (XP, 2000, 2003, for certain; can't remember earlier versions). It happens on any computer (at home, at work, at previous workplace...).
This is not a major problem I need to have solved, but why in the world is Excel behaving like that?! I'd just like to understand it.