Weird inventions can be profitable. I just saw a report on the news about an automated dog wash at a car wash. Get the car and the dog clean all at once! Of course, ideas for inventions that are just weird and interesting or funny is okay too. By the way, the ideas below are not patented, so feel free to take them, make them, patent them and earn a few dollars with them. Good luck!
Wind chimes made from bones. There are a lot of people out there who like the morbid side of life, and I'll bet they buy wind chimes too. Of course, they don't have to be human bones!
Machine that induces naps. Some of the brain wave entrainment CDs I've been using for months are really powerful. One puts me to sleep everytime, anytime of the day. This technology could be used to create a system for baby cribs and kid's beds. The machine would play CDs which slow down brain waves and puts kids to sleep. More than a few parents would buy this.
Wall-mounted furniture. Have a steel track built into the perimeter of the room, and furniture designed to hang from this. The couches, tables and chairs wouldn't need legs, and would be easy to clean under. Of course, if you produce the system, the customer has to buy furniture from you.
Furniture that glows in the dark. Perhaps it would be more practical to have just the edges trimmed with a glow-in-the-dark material. No more bumping into the coffee table in the dark, and a nice party atmosphere too.
Alarm clock that uses voices. Here's one of those easy inventions, and it isn't even that weird. Use one of the "sampler" chips that are found in electronic keyboards. Push the button to record a short message-alarm. Wake up to your own voice, or record a wake-up message from a sexy friend for more motivation. Have it say what you want. "You're late for work!" might work, or might just give you a heart attack.
Exam survival kit. Are you ready for that big exam? Now you are, with your new Examomatic Survival Kit. The kit contains caffeine pills, ginkgo biloba capsules, aromatic oils that "wake up" the brain, and a dozen quick tips for instantly raising your IQ.
Fish kite. look, in the sky! It's a bird, it's a plane... no, it's the new flying fish kite! It's an inflatable kite (no kite sticks), but it flys just like any kite. Comes with a fishing pole for the kitestring, so you can just reel it in when you're done. Fishing in the sky!
A few ideas, and now it's time to come up with your own weird inventions.