bad ideas

1. invisible car keys

2. force jacket  sleeping bag

3. wooden functional motorcycles

4. gasoline fire extinguisher

5. file cabinet paper shredder

6. waterproof coffee filter

7. cardboard bomb shelter

8. braile fire alarm

9. smell buds

10. waterproof cup

11. splintered wood stair railing

12. headphones for deaf people

13. sunglasses for blind people

14. really easy-to-break window for submarines

15. knife with out handle

16. universal keys