Caffeinated beverages?

Liam canonically likes tea. Clara prefers coffee, though I don't think we see that anywhere. Rocky…from his boundless energy, you'd think he'd enjoy some form of caffeine, but I don't know if he drinks anything caffeinated. Hmm. He might run on sugar.

There's a line in Titanic Voyage, "Coffee? Tea? Monster?" Anyone recognize what it's a reference to? (I may be a bit old.)