Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Add a sentence to the following story that provides insight about the characters.

### Input:
John and Maria were walking down a quiet street in the small town when a lightning bolt split the sky.

### Response:
John and Maria shared an excited look before they both started to laugh, their faces illuminated in the flash of light.