Risk, like beauty, is in the eye of the beholder, and right now what's risky are the stocks that used to let you sleep at night. Those were Jim Cramer's thoughts on Thursday's Mad Money, as he told viewers that with the market experiencing its first true worldwide economic expansion since the 1990s, they need to think about stocks completely different.

In the old days, if you wanted safety, you turned to the industrials. These slow-but-steady names never generated a lot of wealth, but they certainly let you sleep at night. Flash forward to today, when Union Pacific (UNP) shot up 5.6% on a stellar quarter, following Norfolk Southern (NSC) , which was also incredibly bullish. These results added to those of Caterpillar (CAT) , 3M (MMM) , Dow DuPont (DWDP) and countless others, all of which are booming as the world's economy expands.

What's not working in this market? The high-fliers that used to rule the day, mainly the biotechs, like Celgene (CELG) , which tumbled 16.3% on its earnings, along with Bristol-Myers Squibb (BMY) , down 4.7%. Food maker Hershey (HSY) also struggled after it reported, off 5.2%.

On Real Money, read Cramer's rules for earnings season selloffs. Get more on his insights with a free trial subscription to Real Money.

Executive Decision: Grubhub

For an "Executive Decision" segment, Cramer sat down with Matt Maloney, founder and CEO of Grubhub (GRUB) , the food delivery service that just posted a four-cents-a-share earnings beat with revenues that were up 32% year-over-year. Shares of Grubhub are up 57% for 2017.

Maloney said that in his business, scale matters, and Grubhub has more restaurants in their system than anyone else. No one has a broader selection of choices. That's why he was very excited about Grubhub's partnership with Yelp (YELP) , which will increase their exposure even further.

As for spending, Maloney said that they're spending just to keep up with demand, as their market could justify a Grubhub that's 10 times their current size. It's all about convenience and the low transaction cost. When the infrastructure is there, people use it, he said.

Cramer said Grubhub continues to be a remarkable story and one which few people thought could be possible.

Don't Believe Every Tweet You Read 

It's time to talk about Twitter (TWTR) , Cramer told viewers. No, not Twitter the stock, which did indeed have a great day, soaring 18.4% as the company's efforts to stop the trolls appears to be working. Cramer said that for the first time in a long time, people are starting to talk about stocks again, but the commentary isn't a good thing.

If you want to root for something, root for your local sports teams, Cramer continued, but when it comes to stocks, there shouldn't be any cheerleading, only rigor and discipline. If you see a tweet that says "Cramer likes this stock" or "Cramer hates that stock," don't believe it, he said. You must always maintain a sense of objectivity and always do your own homework. Following the pack, on Twitter or elsewhere, is just plain dangerous.

Cramer and the AAP team say DowDuPont's preliminary third-quarter results are positive. Find out what they're telling their investment club members and get in on the conversation with a free trial subscription to Action Alerts PLUS.

Executive Decision: Briggs & Stratton

In his second "Executive Decision" segment, Cramer also sat down with Todd Teske, chairman, president and CEO of Briggs & Stratton (BGG) , the small engine maker with shares that were up 6.9% on the day thanks to strong quarterly earnings.

Teske said that the recent hurricanes disrupted the lives of many Americans and his team did an excellent job getting generators to where they were needed most. Generators will only provide a short-term pop in sales however, which is why he was most excited about his company's commercial business.

For customers like grass cutters, the name of the game is efficiency, Teske said, and that's why new products, like Briggs & Stratton's InfoHub, will help commercial cutters know where their teams are and how long it takes them to get the job done.

When asked about American manufacturing, Teske said that Briggs & Stratton has always been in the U.S. and 85% of their products are still made in the U.S. What's changed is automation, he noted, which is why the demand for skilled labor continues.

Executive Decision: American Electric Power

For his final "Executive Decision" segment, Cramer also checked in with Nick Akins, chairman, president and CEO of American Electric Power (AEP) , the utility that just posted a six-cents-a-share loss, but still saw shares rally.

Akins said that we've been experiencing the mildest weather they've seen in 25 years, which cost the company three cents a share in earnings this quarter and 16 cents so far this year.

Akins said every sector of the economy is improving, which is why they continue to invest in their transmission network. His company's Wind Catcher project will be the largest wind project in the country, providing 2,000 megawatts and billions in savings to their customers.

Cramer said that American Electric Power continues to deliver. 

Lightning Round

In the Lightning Round, Cramer was bullish on FMC Corp (FMC) , ZAGG (ZAGG) , Splunk (SPLK) and Salesforce.com (CRM) .

Cramer was bearish on Albemarle (ALB) and Brunswick (BC) .

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At the time of publication, Cramer's Action Alerts PLUS had a position DWDP.

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