Punctuation marks are the weird symbols located above the numbers on your keyboard. They are used in written language to indicate word and sentence structure.

Punctuation Throughout History

Early Europeans standardized punctuation to make it easier to read the Bible out loud to Native villages they were raping and pillaging. As humans slowly phase out the need for physical activity, punctuation is becoming overlooked by texters and bloggers who see the practice as an archaic exercise for the "mouth talkers."
The period is the most commonly used English punctuation mark. While its role as a sentence separator leaves it neck and neck with the comma, its use in obnoxious acronyms has historically been the real difference maker.

Annoying Trends in Punctuation

This lesson goes for other punctuation marks as well. While "You have cancer of the :" may be the most efficient way to deliver a diagnosis of colon cancer over Instant Messenger, one should strive for clarity when using punctuation. For instance, the recipient may believe that you were about to enumerate different types of less deadly cancers they have.
For this situation, we recommend the clearer and more emphatic, "You have cancer of the colon!"
People like a straight shooter.