[Looks confused again- oh, right, Gojyo doesn't know about that anymore. He probably doesn't remember being told about it by Goku or by Sanzo. Goku shrugs.]

... You can ask, I don't mind. [It's a painful memory, but not one he ever minded talking about. Goku doesn't really have secrets.] I'm not sure if it was really a jail... There was never anyone there but me.

But I guess someone put me there once, and I must have done something bad, so maybe it was jail.

[He doesn't remember it, but there's always been some talk about gods and crimes against heaven and other things Goku doesn't understand and didn't bother thinking about too much.]