Something about them just doesn't add up. Not just t-rex's but dinosaurs in general. I know that all the continents were connected at that time and that the weather was warmer so basically ever square inch of land on the earth was suitable for life. Despite this, i have to believe that a dinosaur's metabolic rate was really really slow. It took several months for eggs to develope into full grown dinosaurs and if the meat eaters had to eat several times a day (even everyday) theres no way that balance could continue for several millions of years unless there were more dinosaurs running around then than there are people today. Anyways....
You can't fully believe that over the course of their dominance there weren't a few genetic screw ups. There had to be dwarfs and giants of every type of dinosaur. A dwarf t-rex and a giant raptor could very well of been about the same size. Now given that they only have a reptile brain and not a mammel one (the reptile part of our brain is the one that kicks in when we're drunk. So basically these things had 3 goals: Fighting fucking, and eating) they hook up considering they're both roughly the same size.
Now you have a t-rex with raptor genes intertwined. Now out of the several mutant offspring one might hook up with a plant eating dinosaur (a horse and a donkey make a mule, its not completely impossible but mules are sterile which may cast some doubt on this). Assuming all offspring of the previous mutant hook up are not sterile, you have an even more jacked up breed of dinosaurs. These things would have a t-rex's shear size and strength (a t-rex's size gene would emerge again after a few generations), a raptor gene giving it powerful arms that are proportional to its body as well as sharp claws, and a plant eaters gene giving it an evolved digestive system allowing it to eat plants and animals. Odds against this being possible are almost overwhelming but in the 100,000 year of human life, we've produced chinese men that are over 7'0, a black man that excels unbelievably well at golf, and a white man who can rap better than most black people so nothings impossible.
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