I've always had a hard time making a purchase of a movie I've seen in theaters or rented previously. Will I watch it enough to merit the $20 loss?

These movies are some of the most re-watchable movies of all time. (Okay, I included some trilogies, but how could I not?!)

The Fifth Element

Lord of the Rings

Jurassic Park

The Princess Bride

The Big Lebowski

Star Wars Trilogy IV-VI