Bitcoin (n.) is betting against your government.
Bitcoin (n.) is totally novel. Asking Warren Buffett about it is like asking Elton John about dubstep.
Bitcoin (n.) is libertarian Beanie Babies.
Bitcoin (n.) is the most certain form of money we've ever had and if money is an insurance policy for dealing with uncertainty you would want maximal credibility in the properties of money to deal with that uncertainty and that is bitcoin.
The Dime's (n.) only value is that it makes a good screwdriver.
A Dime (n.) is a dollar with all the taxes taken out.
A Lucky penny (n.) is a coin worth nothing that people keep for years because it was on the ground.
A Lucky penny (n.) is picked up by people who would not bend down for the money.
A Nickle (n.) survives in jars long after prices forgot it.
6 concepts in this list.