What are some good conversational chatbot's you've come across?

With all the hype towards chatbots, I still haven't come across a chatbot I can say was really useful to me or was really fun to use. PS: I don't consider the "type 1 for x, type 2 for y" bots as conversational bots Have you come across any truly conversational chatbots that you really enjoyed engaging with? What was your experience like? Discussion on twitter: https://twitter.com/codezed_/sta...