You know, back in college a couple friends and I tried syncing Dark Side and the Wizard of Oz and my recollection is that there are a few scenes, and transitions between scenes, where the fit between the two is uncanny. This is even accounting for the fact that your mind will tend to try to make them relate. I don’t think we were convinced that Pink Floyd had done it intentionally but we could see how the legend got started.
Back in our BC (Before Christ) days, the lovely Mrs Prov1322 and I would watch the silent movies on WHYY Channel 12/PBS in Philly and listen to the programming from WMMR. No fancy syncing involved...it was epic. Cannabinoids may have been the reason...