Mad science! Spook-tacular Halloween experiments overflow on the plaza

02:59

YouTube science guru Nick Uhas is on the TODAY plaza to wow Willie Geist, Tamron Hall and Al Roker with wild science experiments, including highly flammable tortilla chips and mad scientist foam fountains that overflow in reaction to a chemical catalyst. But the wildest moment of all is when a Halloween prop suddenly comes to life and seizes Willie – which sends Tamron scampering away.