Billy Crystal was originally approached by Pixar to provide the voice of Buzz Lightyear in 'Toy Story' (1995). He turned that offer down. However, they wanted him so badly for the movie, they took lines from 'When Harry Met Sally' and animated them. Here's the result.
Appears on these pages
When Pixar was in production of Toy Story, they did a screen test of Woody with Tom Hank's voice...