In the movie Central Intelligence, Bob was the typical fat boy that everyone got into high school. Luckily for him, his mind was strong and he used that to his advantage, using the insults as motivation to train and becoming a muscular man who now works for the CIA.
On the other side of the scale we have Calvin. He was the most popular guy in high school, but now he is in accounting, so he has a most boring life while he longs for his past times.
They both agree in a reunion of alumni and Calvin is amazed with the change that has given Bob and the life that leads, an exciting life and full of adventures.
Without knowing very well how, Calvin ends up in the world of Bob, mixed in the international espionage, of which he will not be able to leave as well, entering at last in a type of life that excites him.