Frozen. Tangled. The Little Mermaid. Connected (No Spoilers) - Zien Lin (P4)

Summary: Theory: All three of those movies take place in the same realm. Rapunzel, Flynn, and Eugene (Tangled) are seen arriving for Elsa's (Frozen) coronation. Elsa and Anna's (Frozen) parents shipped wrecked when they were on their way to Rapunzel's (Tangled) return celebration; this wreck can be seen in the underwater scene in "The Little Mermaid." -- There are other Disney/Pixar correlation theories but all the others are too far fetched

Response:  Sounds believable to me, they all take place in geographically the same area and around the same time too.

Source: http://movies.yahoo.com/blogs/movie-news/secret-frozen-tangled-mermaid-connection-other-disney-conspiracy-211709221.html