"Aaaaaaaaaa!" says the hapless bystander.

"Sorry! Sorry - I -" Checking, do they speak English, yes, he's about to speak English - weird accent - "- hello, I apologize."

"You fell from the ceiling."

He speaks English with a Latin accent.

"Yes, I'm confused about that too." She still has her cane; she collects it and wobbles to a standing position, looks for a place to sit that isn't where she landed after she tumbled from his lap.

They're in a study! There are a variety of plush armchairs. 

"I have no idea what's going on and yet I sense it is somehow Ashley's fault."

"I don't know who that is."

"Ashley is my husband, he's a naval captain. --If you don't know who Ashley is, why were you on my ceiling?"

"I think I didn't actually contact your ceiling per se, I think the portal opened slightly below it, or I'd expect there to be ceiling material injuries associated with the process." She looks up. The ceiling's uninjured.

"...What's a portal?"

"Uh, last year, some portals leading to other planets were discovered, it was pretty big news? This one seems to lead to the bedroom of an English-speaking human being but we already knew it was different from the others."

"...I am pretty sure I would know if portals leading to other planets were discovered."

"Is this Earth?"

"...yes," he says, in a tone of uncertainty about what the other options might be. "You're in Londinium, Anglia."

"Well then apparently you wouldn't in fact have heard of - wait, say that again."

"Londinium, Anglia."

"Where is Anglia?"

"It's an island off the continent of Europa."

"List some other countries in Europa for me please."

"Sarmatia, Gallia, Bithynia, Noricum..."

"Huh."

"I assume a strange dominant did not invade my house for a geography lesson."

"I do apologize about that, I tripped, I was not the intended would-be first contact party which you can tell because I'm not wearing a spacesuit. If you care to show me out at least for the time being I won't stop you. However, the portal will continue to open near your ceiling, so whenever they figure out how I got through it any followup they attempt will come through this room and I would like to go home one day."

"It's fine, I'm married to a reasonably understanding husband, I'm not going to be ruined."

"...wow. What year is it?"

"2065."