Dogecoin! Who would say 6-7 years ago that Dogecoin will overtake all coins like FeatherCoin or ApeCoin. After some time we realize how good strategy it was to build this coin on a joke - it has self-spreading marketing. 
Most of the times, we might not be able to predict what would become of a coin. It might look like shit at first, but with times, most especially when the coins get some drive from the community, it becomes an all-important coin and that is to, it has caught its own portion of the limelight. Truly speaking, dogecoin started like a joke and today, almost all exchanges in the crypto space want to list it, without the consent of the team of doge itself.