There's only so much you can pick up from internet research, after all, and Lambert's never been willing to dive feet-first into this shit. But that does ring a vague bell, though he'll have to take a moment to actually remember where he's heard about something similar.

At least Sans's question is a little more straightforward to answer, even if it makes him cross his arms defensively.

"A few months, maybe. I couldn't, when I first got here." Honestly, it's a struggle to recall a specific time. He'd only started working at the cafe a few months ago, and got briefly turned into a cat in the middle of that, so keeping track of which customers were and weren't actually inhuman before wasn't high on his list of priorities. "I wasn't sure, but the description fit."