So.... On TikTok Nathan Fillion has been going around to many of the Firefly actors, knocking on their doors, and then having an exchange of them asking some variation of "Oh... is it time?" and him responding "It's time."
... "Some of you have guessed convention, podcast or cross-over. You are wrong."
...
Just the other day he knocked on Jewel Staite's door:
NF: "Jewel..."
JS: "...Wait, are we..."
NF: nods, "Yes... we are..."
JS: smiles, "...Shiny."
NF: smiling, "I was hoping you'd say that.