The future is ... crap!
When this came out, I was 11 and my sister was 8 and we thought this was the funniest line in the film. Poor Wayne!
Wayne: At Szalinski Labs, the future is [drops cards] crap! No! The future isn't crap! The future is [logo appears behind him] now!
Add to that his sad little impression of the muscle man in their logo. So hilarious!