Google Shows Ratings Snippet 8 Out Of 11?

Dan Barker spotted a fun rich snippet in Google where the ratings displayed for an IMDB movie result was 8 out of 11. Out of 11, not 10, 11. Dan posted this on Twitter and said "The only title on IMDB where the review is out of 11."

Here is a screen shot:

If you actually look at the markup it indeed says the bestrating property is 11, so technically this is what they are passing to Google.

Other movies do not do this, such as Frozen:

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