"Above me a flood, below me a fire. What am I?"

And the answer for that riddle is "the bathtub", but I don't understand how it could be that.

Eh? Because that's how the bathtubs back then worked...

I've never seen that kind of bathtub.

Of course we wouldn't know of it.

We're not from the same generation as Ms. Asahina...

I think you've drunk enough...