A really realistic reaction would have been Fred killing passerby, smashing things with a club, and possibly soiling himself.
So the Great Gazoo is, well, showing off to Fred and Barney about how he knows what life is going to be like in the future of the Flinstoneverse. Well, yes, we all know that the Flintsoneverse eventually evolves into, and crosses over with, the Jetsonverse, and that at some point the Flintstones and the Rubbles travel through time to visit the 1964 World’s Fair, so Fred and Barney should be no strangers to time travel. But when Gazoo offers them a peek into tomorrow, Barney chickens out and settles for asking Fred to get him a present:
Or perhaps Barney didn’t trust that rickety ol’ time travel machine. Or Barney recalls those other time travel adventures and figures enough’s enough…assuming this story takes place after those stories, and that anyone remembers anything about whatever time travel adventures they did have…man, I don’t know. Time travel is complicated.
Anyway, Fred and the Great Gazoo zip into the 20th century, and Fred sees things like airplanes and cars and boats and supermarkets and dancing and other things I’m pretty sure existed back in Fred’s time, only not quite as dinosaur and / or foot-powered. However, I find Fred’s reaction to this particular future invention to be somewhat realistic:
And then Fred wonders about this other modern innovation:
Well, despite the fact that Fred obviously didn’t care for all that smoke, when it came time to pick a little gift to bring back to the past and share with Barney, guess what Fred chose?
Hmmm…that’s not quite the attitude Fred and Barney had about smoking early on!
Of course, modern days smokes are probably a little more potent, and likely too overwhelming for caveman lungs. You may want to consult a scientist for further information about this topic…the topic, of course, being smoking cavemen, time-traveling aliens, and, um, man and dinosaurs coexisting, which really doesn’t come up in this story, but let’s face it, that needs some explaining.