When I first saw Inside Out, I found four moments that I found the saddest:
1. When Bing Bong got sad after witnessing his rocket fall into the Memory Dump.
2. When Joy was crying in the Memory Dump, and saying "All I wanted was for Riley to be happy..."
3. When Bing Bong faded away from Riley's mind.
4. When Riley confessed that she misses Minnesota.
Of these four moments, which would you consider the saddest? I find #4 the saddest.