The final step is to drive the cement truck filled with 2,500 pounds of cornstarch and 250 gallons of water to the back lot at the Ellen Show and pour the goo into a giant bathtub - 7 feet long, 3 feet wide and 2 feet deep. It’s also a good idea to have your oobleck mixing experts change their clothes and spend the next 4 hours mixing the goo by hand to ensure the perfect consistency right before the tub gets moved on stage. How do you move a tub that weighs about 6,000 pounds? Using a forklift, of course.