When Fredo 'meets' Johnny Ola in Cuba...(Godfather Part II)?

First off Fredo slips up, and i didn't think Michael was drunk (Michael was on the look out for who was trying to betray him), and Fredo freaks out because Fredo is by far the BIGGEST WIMP in the entire Corleone family and was scared of what Michael would do to him (and rightly so). And i was supprised at what Michael actually did to him