incidental expense (noun)

1. In the episode, the protagonist had to pay for an incidental expense when his car broke down unexpectedly.

2. According to Greek mythology, Zeus had to deal with many incidental expenses to maintain the gods' residence on Mount Olympus.

3. During their romantic getaway, the couple faced an incidental expense when they had to replace their lost passports.

4. In the anime series, the main character often encounters incidental expenses while traveling to different dimensions.