Mrs Flittersnoop, his housekeeper, causes trouble a few times through her lack of understanding for the Professor's genius. In "The Wild Waste Paper", she throws what seems to be a bottle of cough medicine into the waste bin. The liquid turns out to be the Professor's elixir of life, which was in the bottle because cough medicine is the only thing that can stop the stuff dead without actually destroying it. Since the bottle was uncorked to allow air in (nothing can live without air), the waste paper in the bin comes to life. Even when stuck up a pear tree surrounded by giant, predatory bits of waste paper, the Professor retains his scientific detachment, wondering if a carpenter's bill would know a saw if it saw one, and if so, whether the gas bill might explode at any moment.