DOCTOR: I'm not going to lie to you. This means that your insurance premiums are going to go through the roof. In fact, pretty much everything is going to go through the roof, because I'm going to blow up the lab. We just need some kind of a trigger, first.

ERICA: But what are you going to blow it up with? * (lightbulb moment)* The bacteria is making ethanol. The greenhouse and the lab are full of it!

DOCTOR: Seriously, what are you doing when this is all over?