Absolutely! I believe post it notes were invented when someone made an adhesive that was far too weak to be used for the original purpose and someone came up with the idea to put it on a sheet of paper and made millions of dollars. An "accidental" discovery that really has changed the world, maybe not revolutionary, but almost everyone uses post its at some time.

I also think silly putty was the result of an accident.

I wish my Mom would have seen that

accident is one of humanity's more important tools ;)

it would have saved a lot of money that was spent on plastic sheets for my bed. When you're young, you have a lot of important tools every night ;)