Ideas for carnival float - theme is 40 Years Fact or Fiction?

Question

We will be doing a float in our local carnival with the theme of 40 Years Fact or Fiction.

We want fun ideas, which are simple but effective.

Thanks in advance!

Answer 1

Well you could do a flying saucer float(area 51-fact or fiction)

I think that was in 1968 or '9, so it's cutting it close

I'm not sure if it's a general theme, or related to your town.