Recently, a colleague sent me an Excel spreadsheet with the first column (Column A) hidden.
It took me a few minutes to realize what was going on--I could see a partial word in Column B and simply thought I needed to adjust the column width. After fiddling with it for a few minutes, I realized that Column A was hidden and that the partial word was simply a word in Column A that continued into the Column B cell which didn't happen to have any data.