Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis. What : Shares of cruise ship operator Royal Caribbean Cruises (NYSE: RCL) have officially run aground following news that its prior accounting would need a few tweaks. The stock's subsequently down 11%. So what : Generally speaking, nothing good ever comes from the phrase, "accounting error." As if Royal Caribbean didn't have enough to worry about, with its businesses already affected by unrest in the Mediterranean and higher fuel costs, it can now add a $0.10 charge related to the way it accounted for interest expenses for amortizing finance fees. Sounds complicated, doesn't it? Even worse, the company attempted to slide another $0.10 reduction in full-year earnings under the radar in conjunction with this press release, completely unrelated to the accounting snafu. Now what : I'm not a fan of cruise ship companies.