pond scum (noun)

1. Why was the pond scum always invited to parties? Because it never took up too much space!

2. In Greek mythology, pond scum was believed to be formed from the tears of the water nymphs.

3. In the anime series, the protagonist discovers a rare pond scum that grants special powers to its user.

4. During the reign of King Louis XIV, a beautiful garden was adorned with a pond filled with vibrant pond scum.