You can observe a lot by watching.
When you come to a fork in the road, take it.
Little things are big.
It ain't over 'till it's over.
If you don't know where you're going, you might not get there.
If you can't imitate him, don't copy him.
If you ask me a question I don't know, I'm not going to answer.
If the world were perfect, it wouldn't be.
If people don't want to come to the ballpark how are you going to stop them?
I really didn't say everything I said. [...] Then again, I might have said 'em, but you never know.
I looked like this when I was young, and I still do.
I knew the record would stand until it was broken.
The future ain't what it used to be.