Take all the humidity!
The Professor had not thought this through. He had figured that all he needed was a plan and then the rest would fall into place. For example, he imagined that, upon acquiring the ten million Hisense pint dehumidifiers, a warehouse or a giant field would just materialize to house them. But no. Nothing. Only about fifty of them fit in his studio apartment. The rest he left on the street, literally on the street. He could hear the honking of the cars stuck in a traffic jam caused by the wall of dehumidifiers.
His intention had been to wire them all together thus building a device capable of stealing all the world's humidity. He had even planned his speech, the one he'd hijack a television signal to deliver. He'd say, "So either you pay me the money I've demanded or prepare... to dry." It was a great play on words, the Professor thought, one that he'd never be able to deliver now, due to space issues. Also he hadn't quite figured out how to hijack a television station's signal.
"Next time, buy the humidifiers LAST," the Professor said to himself. Then he put in his ear plugs to block out all of the honking and went to sleep.