If you want to have some more fun, CapK, the next time you ask someone, How do you do?, How're you doing?, or How are you today?, and they answer fine or just fine, immediately say, And you?
This leaves them completely lost, and some of the looks and reactions are priceless!

Q: Hello, how're you doin'? A: Fine. Q: And you? A: Uhhhhhhhh.....