In my computer class I'm going over copyrights, intellectual property, DMCA, etc. Part of that was a discussion on trademarks and how some brands can become so popular, they are used as the generic term for the category of product. Here's a list I came up with as examples.

Alkaseltzer > effervescent antacid ( Read more... )

"spang"
the sound made when a person is hit in the face with a shovel