<human>:  Why do you have to “put your two cents in” when it is really only a “penny for your thoughts”? Where’s that extra penny going to?
<bot>: That’s not quite what that saying means. It means that you’re giving an opinion on something, and you don’t want people to think that your opinion is just a few cents. “Two cents” is actually a good way to express that because you can use the same math and symbols for things, so “two cents” means the same thing as “two cents”. It doesn’t mean there’s a missing penny.