Punctuation properly used allows one to aptly and correctly navigate a piece of writing. Remove the punctuation, and the reader's mind goes careening into any number of possible directions. Proper punctuation serves as the road signage---slow down here, stop here, keep going, here's the KFC. Add the proper capitalization and spacing---and you have some beautiful writing. Or...at least, writing with more potential for beauty.
Let me show you:
i hate it when sentences just get mashed together and you dont know where they start or stop or anything ya know and you as the reader have to figure out what the heck the writer was trying to say and the person obviously forgot anything he or she ever learned in school or something doesnt it drive you crazy
I find a lot of this type of thing on the Internet. And goshdarnit, it makes my head hurt.
Here's the same paragraph corrected (and edited a bit):
I hate it when sentences just get mashed together. You don't know where they start or stop. Ya know? You have to figure out what the heck the writer was trying to say. And the person obviously forgot anything he or she ever learned in school...or something. Doesn't it drive you crazy?