spur of the moment

aha moment

The moment or instant at which the solution to a problem, or some other significant realization, becomes clear.

at any given moment

At any point in time.

eureka moment

The moment of a sudden unexpected discovery.

Hallmark moment

A memorable moment or event, one which would either make for or call for a poignant greeting card.

have a moment

To reach a high level of popularity during a specific time.

Hollywood moment

A moment of great drama or sentimentality, suggesting the climax of a film.

light-bulb moment

A moment of enlightenment, inspiration or sudden realization.

moment in the sun

A brief instance in which an otherwise obscure, unremarkable, or humble person draws attention.