HAVE A BALL

If you had a ball, it means you had a great time.

The idiom most likely originates from the definition of ball as a large, social gathering where dancing is involved.

Ted: Did your dog enjoy himself in the dog park?
Vincent: Definitely. He had a ball! Literally and figuratively. 

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THINK OUTSIDE THE BOX

To think outside the box means to think freely without limiting structures or rules.

Example: The inventors at the company Apple really think outside the box. Their products are innovative. 

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CALL DIBS

If you "call dibs," on something you are informally claiming it as yours before someone else claims it.

For example, when people go for a ride in the car, someone might call (first) dibs on sitting in the front seat because it is more comfortable.

SAVED BY THE BELL

If you were "saved by the bell," you were saved by the last minute intervention of someone or something, such as a bell ringing. This idiom comes from the sport of boxing where a boxer who is down can be saved by the bell which rings at the end of a round.


Example: The teacher asked the student a surprise question, which the student couldn't answer. Luckily, the bell quickly rang, and the teacher was forced to dismiss the class. The student was literally saved by the bell.