Well if you like that kind of thing you'd probably appreciate gifsound.com and reddit/r/gifsound. Not exactly video-video synchronisation, but close.
There's also the famous Dark Side of the Moon (by Pink Floyd) and the Wizard of Oz synchronisation. Perfectly matches. Pink Floyd has a few others.
Also, did you hear that any old movie, if you take its sound track out (not the official music release, but the raw audio from the movie) and then play that next to the same movie it perfectly synchronises? Like, seriously, people's mouths are moving and you hear word for word what they say!
The otters are coming with whiskers honed to razor blades. Know this and fear.
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