"Probably not a good time," Thor agrees, smiling. "I have been meaning to talk to you more about Asgard. You already know about the Bifrost -- the rainbow bridge, right?"

Thor's pretty sure he mentioned it.

"Have I told you it's flat yet? The planet, I mean."

That usually catches people off-guard, but if by some miracle that little bit of weirdness triggers an immediate aha! moment for her, well -- more evidence that she's Sif.

And if it doesn't, no big loss; they'd just have to continue working at bringing her memories back.