Grammar... Why pick on this?

If that last post had some grammar in it that struck you as strange, its because I have only one pet-peeve with written grammar. If nothing else, never end a sentence with a preposition. I speak that way, but can’t stand to see it written. Common examples that get on my nerves are:

• What are you up to?

• You know where that guy is from?

• He’s a cool guy to hang out with.

These are all really strange when you correct them. But I prefer them that way because they are correct. I would never speak like this, however:

• To what are you up to doing?

• From where is that guy?

• He’s a cool guy with whom to hang out.

Just thought I’d share. Enjoy!