An instrument of torture for goldfish, who, aside from being deprived of room and, often, sufficient oxygen, turn paranoid due to its transparency, and disoriented due to its spherical shape.

Goldfish are much appreciated for their silence. In particular, they compare very favourably to the neurotic parrot and the neurotic dog.

A type of storage space and living quarters for goldfish, along with any other type of fish that doesn't mind living in a clear glass (or plastic) ball.

Additionally, a slang term implying the act of densely filling an enclosed space (such as a car or bathroom) with thick marijuana smoke. See also hotbox and clambake.