Recently Event-Driven Design became one of the most popular Buzz Words. This approach is shown as the model way of the modern, scalable systems. I'll play the devil's advocate and show in practice what may go wrong. I'll show that this experience may be painful. I'll tell of how you may end up with distributed monolith and the concrete tips on how to prevent that. I'll explain all those enigmatic terms as idempotency, eventual consistency, at least once delivery, etc. I'll bust few myths and show facts without evangelisation. All of that will be flavoured with a dose of the healthy pragmatism.