Characters in a movie watching the movie they're in

1. Spaceballs (1987) - Lord Dark Helmet are trying to find Lone Star so they pull out the VHS tape of spaceballs to find out what happens next

2. In the Mouth of Madness (1994) - John Trent goes looking for a missing author whose work begins to blur the lines between fiction and reality, only to find out that this author has been writing his actions since the beginning, and that author's book is made into the movie we're watching