Jetpack 3.9.6 was released yesterday, a day after 3.9.5 was released. Jetpack 3.9.5 was released to ensure compatibility with WordPress 4.5 Coleman. Shortly after issues the routine upgrade, reports flooded in about random videos being added to comments.
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In the bug, any number string in the comments section is being converted into a Vimeo video. For a temporary fix, Jetpack recommended deactivating the Shortcode Embed module.
We’re aware of an issue with numbers in comments embedding random Vimeo videos and are working to get 3.9.6 out as a fix ASAP.
— Jetpack (@jetpack) March 31, 2016
While the bug was simultaneously annoying and humorous, a fix arrived with 3.9.6. If you already updated to 3.9.5, Jetpack and WordPress recommend you do so again, to patch this bug.