Threw vs Through

I'm not normally a spelling or grammar Nazi, but for some reason it's a little pet peeve of mine when someone uses the wrong word when it comes to threw and through. I'm not the best speller there is, and although sometimes I'll notice a error here and there it usually doesn't bug me unless it's really messed up and also happens to be a word I know well. Same goes with your and you're; and there, their, and they're. I know the differences and try to use them correctly, occasionally I'll slip up, but they all still refer to a person and can be easy to misuse if writing quickly. It's not like that with threw and through for me. Sure they sound the same, but they are completely different words.

Illistration from http://homophonesweakly.blogspot.com/   

Here's some information that might help you sort them out in the future, with a little help from Google search definition:

Threw: it's a verb (a word used to describe an action, state or occurring, and forming the main part of the predicate of a sentence), and the past tense of throw.
-Propel (something) with force through the air by a movement of the arm and hand.
-Push or force (someone or something) violently and suddenly into a particular physical position or state.

Through: can be a prepositional (requiring and object) adverb (modifies a verb), or an adjective (descriptive word)
-Moving in one side and out the other side
-Continuing to another destination

Really the simplest way to check if your using the correct term is to remember that threw is the past tense of throw, so if nothing was thrown most likely you want to use though.

Examples:
-He threw the ball over the fence. If through was used then it couldn't have also gone over the same fence. Then he would have threw the ball through the fence.
-We drove through the night to get there. If threw had been used then we would have had to actually thrown the night, but since night is not a physical object, that is not possible.

Do you have any examples on using threw or through? What is your writing pet peeve?