A transporter so you wouldn't have to fly or take a train to visit someone far away !
Ok. You asked for it. A penis enlarger. Like an android app where you can customize your penis features. You press a button and BAM!!You're hanging really low. I can see how it would be abused though.
Sound-actuated, wheeled suitcase that would follow you around and come to heel at the sound of your voice.
Battery operated, heated bras for girls who like light clothing in cold weather.
Periscopes for drivers of smaller vehicles who are unable to see around SUVs.
Windscreen wipers for spectacles.
A humane mousetrap made of two cupped hands on the ends of metal arms. They snap together, imprisoning the mouse without harming it. I'd call it a clap trap. I write a lot of that. :)
And I once invented an art form called Cheryllian Schematics. Cheryl was the bar girl on duty that night and the schematics were the patterns you make with the bottom of your glass in the puddle of beer on the bar. All I had to do then was sprinkle it with coloured cement, wait for it to dry, and I could have sold the originals for a fortune. It's was the bar owners that nipped it in the bud. I never found one who'd let me near his bar with a chain saw. Bloody philistines, the lot of them.
I am with Rooster, a teleport machine. Say you want Italian for lunch? It would be dinner time there, so pop over for a bite to eat. Your younger brother gets injured 5 stats away, and you are there for support in minutes. Travel business and be back home in your own bed that night.
A variable strength, adjustable field of influence, pocket sized, anti-gravity field generator.
A mircler fiber strong enough to enable us to build a beanstalk.
I am gonna have to go with a money tree again! LOLOLOL!
Something that will enable us to travel to the end of the universe quickly without causing time dilations, like in Star Trek.
Self cleaning clothing.
Probably a machine that reads the mind of a person which tells whether he/she is good or bad in character It also solves many problems :)
The Shrink Ray.