There are some films that offset each other in such a curious manner that they're guaranteed to provoke a memorable conversation. If you're reading this with a satanic sense of humor, and want to get a rise out of some of your siblings or friends, here's some double features that won't happen in a million years.
Ratatouille followed by Krysar
Robin Hood followed by The Tale of the Fox
My Neighbor Totoro followed by Belladonna of Sadness-This is about the only combination that is more uncanny than the theatrical double bill with My Neighbor Totoro followed by Grave of the Fireflies. This combination, is of course, not for children though you could put the kids to bed and watch the second while they're asleep.
Bambi followed by The Plague Dogs
Sleeping Beauty followed by Kirikou and the Sorceress
Charlotte's Web followed by Animal Farm
Who Framed Roger Rabbit? followed by Watership Down
The Aristocats followed by The Cat who Walked by Herself
Vampire Hunter D: Bloodlust followed by Vampires in Havana
A Bug's Life followed by Fantastic Planet
The Lion King followed by Gandahar (English subtitled version from Britain)
Spirited Away followed by Angel's Egg
As much as I'd like to write about each one of these, it would be better to see both, though perhaps at different times so that you can discover my reason for the comparisons.