Stupidity is contagious -- even respectable companies can catch it. As we do every week, let's take a look at five dumb financial events this week that may make your head spin.

1. America isn't riding on Dunkin'
It's never cool to offer up a scapegoat that doesn't hold up across the industry. Doughnut giant Dunkin' Brands (DNKN) missed Wall Street's top- and bottom-line targets, blaming winter snowstorms for the shortfall as same-store sales only rose 1.2%. 

It's easy to see why wintry weather kept drivers off the road, but shouldn't the allure of Dunkin' Donuts' coffee be a dinner bell in the cold? The bearish thesis came undone later in the week when Starbucks clocked in with a 6% spike in comps during the same quarter.

It's true that Dunkin' Donuts does have a particular concentration in the Northeast, where the storms were at their worst. There's also something to be said about Dunkin' Donuts being known more for its doughy treats than its java. But it still wasn't a flattering turn of events.  

2. Tarnished arches 
Comps at Dunkin' Donuts may have failed to keep up with inflation, but things were even worse at McDonald's (MCD 0.37%). The world's largest burger chain's U.S. comparable-restaurant sales declined 1.7% for the quarter.

This isn't a fluke. Comps have been negative at McDonald's for three consecutive quarters. That's pretty significant for a chain that had pieced together nearly a decade of positive comps before starting to feel mortal. Widening its menu options hasn't helped, and late last month McDonald's moved to push prices higher by an average of 3%. That won't help turn store traffic around.

3. Cereal killer
Before you click "like" on that Cheerios fan page, you may want to consider whether it will prohibit you from suing General Mills (GIS 1.93%) in the future. General Mills caught some heat last week after updating its privacy policy, requiring all disputes related to purchases for anyone patronizing a General Mills online property to be "resolved through binding arbitration."

New York Times article suggested that something as simple as using a General Mills online coupon or following any of its brands through social media would prohibit someone from getting into legal fisticuffs with the food giant. General Mills countered that the new privacy policy was being misunderstood, but it still reversed it this past weekend. 

4. Panned-ora
It doesn't seem fair at first, but Pandora (P) posted better-than-expected financial results for the first quarter and raised its top-line guidance for all of 2014, but the stock still took a hit. The culprit here is that most of the $10 million upside revision in the music streaming leader's outlook was accounted for during the first quarter.

It also didn't help that guidance for the current quarter -- calling for $213 million to $218 million in revenue -- is short of the $219.3 million that Wall Street pros forecast. The streaming market is starting to get more competitive, and Pandora can't afford to disappoint, given the stock's lofty valuation.

5. Just due it
Nike (NKE -1.26%) may be ready to bow out of the fitness bracelet market. CNET reported that layoffs at the FuelBand's hardware division suggest that it will discontinue the activity-tracking wristbands that have been a distant third in the market. Fitbit and Jawbone continue to dominate the niche. 

Nike denies that it's bowing out of the market, but industry tracker NPD Group is reporting this week that FuelBand's market share has shrunk to just 7% of retail sales. This is just a hunch, but I think failing to roll out an Android Bluetooth app and keep pace with smartwatch innovations doomed the bracelet.