Obscurity factor: 10
I wanted to feature a patriotic cartoon today and I don't think I could have found a better one. This trippy, psychedelic example of government produced propaganda was put together by animator Vincent Collins on the 200th anniversary of our country in 1976. If you're prone to epileptic attacks then be careful watching this one!
I haven't been able to find this on DVD anywhere, but it can be seen in full on YouTube, thanks to an upload by jamesklambert.
Obscurity factor: 10 (not on DVD, virtually unseen since it debuted in '76)