That's an odd reaction. Joseph pauses, and for once his expression is somber and deeply pensive. It... actually makes him look quite a bit like his grandfather.

"1938, last I checked. There's all sorts of technology here I'm not accustomed to, but with the whole 'new world' thing I hadn't really considered if this was a different time. Although that does make sense."

It sounds like he's wandered away from the topic, but his gears are still turning and he's watching Emporio intently. After some more thought, an impish grin passes over his face.

"You're about to say 'You're Jonathan Joestar's grandson', right?"