These lyrics from the song Love Story by Taylor Swift refer to the play by Shakespeare of Romeo and Juliet; a very famous couple known for their forbidden love. This allusion is very powerful in this scenario since it engages the listener by making a connection to something they already know about to help them remember the theme or the message driven by the song. Also, it gets the writer's point across without going into a lengthy discourse.
"Her eyes carried a certain kind of silence that begged to be understood and i felt as if i was a scientist, staring with eager, feverant eyes into galaxies that have not yet had the chance to be named.” ― Christopher Poindexter This quote creates a reference from trying to figure out one's mind to a scientist exploring an unknown galaxy. This is a very effective allusion because it allows the reader to imagine the breadth of one's mind by comparing it to something as massive as the galaxy. It helps the reader understand what the author is trying to convey much faster because of the short reference that has so many connections to the actual thing.