Today's fun internet trick: YouTube Time Machine. As its creators say: "Pick a year, click refresh, and TRAVEL THROUGH TIME." Well, watch a video from or pertaining to that year, anyway. Real time travel is not yet supported by YouTube on desktop browsers, though I hear the feature is in beta.
An example of what you'll find: a Civil Defense Film from 1951. Representative quote from the paternalistic narrator: "If you live in an apartment house, rules for taking shelter will be posted in your building. LEARN THEM."
Or a Bozo the Clown broadcast from 1966 (for younger viewers, this will explain a lot about Krusty the Clown):
Boy, life used to be weird. After the jump, witness an 1894 video of Thomas Edison's boxing cats. (The cats do not seem to enjoy boxing. I think they would prefer playing with boxes.)