LORELAI: Well, maybe you can train Rachel to use a magic marker to mark the milk exactly where you left it.
Magic Marker is a brand name for marker pens, felt-tip pens, or textas, made by Bic. The name is used to refer to any similar kind of pen.
Magic Marker
Published
The Annotated Gilmore Girls 
Because it can write on any surface, Sidney Rosenthal, the creator of the Magic Marker brand, gave it the name “magic marker.”
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