Douglas_Knight comments on Bridge Collapse: Reductionism as Engineering Problem - Less Wrong
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It's used in Microsoft Excel. If you have multiple worksheets, you preface a cell reference with "<sheetname>!" to specify which sheet you want that cell reference to be resolved on.
i.e.
"A3" means "the value of the cell in column A, row 3, on the current sheet", whereas
"Sheet1!A3" means "the value of the cell in column A, row 3, on Sheet 1".
Here are two theories that I find much more plausible than Excel.
Added: I said two theories, but the differences are small and not really relevant here. They agree on the essential point that it started as "Action! Mulder" (or something similar) with more normal spacing, with the exclamation point associated with the modifier and functioning pretty much as normal.