Spread sheet errors: They're there

"It is completely within the realms of possibility that a single, large, complex but erroneous spreadsheet could directly cause the accidental loss of a corporation or institution," Croll added. "If the uncontrolled use of spreadsheets continues to occur in highly leveraged markets and companies, it is only a matter of time before [some random] event occurs, causing catastrophic loss."

Spreadsheets, so common today, are prone to errors and mistakes. Be careful that what you see and calculate is really what you want.