Englebart famously demoed possible ways of interacting with computers that are now ubiquitous decades before they were actually popularized. I made a joke about

Englebart famously demoed possible ways of interacting with computers that are now ubiquitous decades before they were actually popularized. I made a joke about him only having those ideas because he was a time traveler from the future, but tried to implement them too early. Then, after he already didn't make billions from his ideas, he couldn't use his future knowledge of investment because his demo was still big enough to change which companies got wealthy (explaining why he didn't make billions investing in the companies that actually invented those ideas in his timeline).