In Empire, Luke found out Vader was his father, but instead of putting away his lightsaber and talking about it, he overreacted and got his hand cut off.

I mean, they worked it out eventually, but at what cost? Another Death Star was destroyed, Boba Fett got eaten by the Sarlacc, and we got the Ewoks. It all could’ve been avoided if they’d just, you know, communicated. And let’s face it. The Ewoks sucked, dude.~