"This is extreme, even for you", Frozen :) or if you want angst: "What if something happens to them?" (Not that the first necessarily has to be light and the second angst, if you can subvert that even better!)
DA!verse, 5 sentence fic!
Anna stopped short in the kitchen doorway, gaping as she watched Elsa pouring coffee into large empty wine bottles with fancy French lettering on them.
“Elsa…what on Earth are you doing? I mean, this is extreme, even for you.”
“I need coffee everywhere I go,” Elsa explained, “And I need five wine bottles’ worth to get me through the next forty-eight hours.”
“Well, I don’t drink wine anyway, and I don’t know where the heck you got those from, but if you want to use them to “store” coffee, then be our guest.”