Remember The Simpsons episode "The Musk Who Fell to Earth"? Apparently a lot of people do and they have ideas for Elon Musk. Quantity is better than quality when it comes to finding the next big idea. How about edible tape for overstuffed burritos? My personal favorite is a way for blind people to "see" memes.
Not all of the ideas are bad. Just invent lightsabers or a teleporter. Simple, right? Or invent a time machine so you can get the schematics for not yet invented inventions that exist in the future.