How can you tell if or when an anime series or anime movie is being play on the screen just sa pamamagitan ng LISTENING to it from a distance (and when you're someplace else within hearing distance)?

The opening song or credits help me. Certain anime series or pelikula have particular openings that are unique to them. For example, I know when Yugioh is on when the voice of Yami (Dan Green) says, "Previously..." or the opening theme starts playing.

This is the full theme song, but those opening notes are distinctive to Yugioh.