In 6th grade for a public speaking assignment I gave a presentation on the world wide web and described how we could eventually use it for checking your bank account or ordering a pizza. My teacher said we'd never get there.
Hope you're still waiting on hold for that pepperoni Mrs. Z!
In college in 1982 the professor wrote "blips" on the chalkboard abd said in the future all money would be blips in a computer, and we all laughed and said that's ridiculous, computers will never be reliable enough to trust with that.