One of the most overboard slogans about Bitcoin: Bitcoin is your and your children's future, a mural on the read wall of a so-called Bitcoin embassy (that is a Bitcoin exchange business).
Another one, Bitcoin is freedom. Compared to the other feels almost not overblown. Both murals seem to have been there at least since 2014, don't know exactly since when, but I still remember a time when Bitcoin fanboys expected it to destroy existing monetary systems in a few years.
Now these dreams are over, and although Bitcoin is not going anywhere, it's no longer Bitcoin that is expected to bring a revolution. Which is perhaps good, anarcho-capitalist revolution is not exactly what I'd like to live through.
(images from: Senya, Sergey Little)