Euphemism

eu·phe·mism –(noun)

1. the substitution of a mild, indirect, or vague expression for one thought to be offensive, harsh, or blunt.
Examples: "Heavy set" vs. fat
"to pass away" vs. to die
"rest room" vs toilet

Antithesis

Antithesis: Contrast of ideas by means of parallel arrangements of words, clauses or sentences.
Easy on the eyes, hard on the heart.

Onomatopoeia

Onomatopoeia

the naming of a thing or action by a vocal imitation of the sound associated with it.

(Merriam-Webster's Online Dictionary)

Situational Irony

Main Entry: iro·ny

Pronunciation: \ˈī-rə-nē also ˈī(-ə)r-nē\

Function: noun

Inflected Form(s): plural iro·nies

Etymology: Latin ironia, from Greek eirōnia, from eirōn dissembler

Date: 1502

1 : a pretense of ignorance and of willingness to learn from another assumed in order to make the other's false conceptions conspicuous by adroit questioning —called also Socratic irony
2 a : the use of words to express something other than and especially the opposite of the literal meaning b : a usually humorous or sardonic literary style or form characterized by irony c : an ironic expression or utterance
3 a (1) : incongruity between the actual result of a sequence of events and the normal or expected result (2) : an event or result marked by such incongruity b : incongruity between a situation developed in a drama and the accompanying words or actions that is understood by the audience but not by the characters in the play —called also dramatic irony, tragic irony

ex. It was ironic that Reagan was shot after the bullet ricocheted off of his "bulletproof" car.

Source: Merriam-Webster Online Dictionary

Understatement is pretty unnecessary in life..

(Scan was cropped at the bottom, so I added the text on my computer)

Understatement: noun 1 : a statement represented as less than is the case
2 : a statement stated or presented with restraint especially for effect

(Merriam-Webster's Online Dictionary)

ex: To say that time travel is exciting would be an understatement.

Ellipsis

Definition: The omission from a sentence or other construction of one or more words that would complete or clarify the construction

Example: The New York Times calls Titanic "...a breathe taking drama".

Pun

The humorous use of a word or phrase so as to emphasize or suggest its different meanings or applications, or the use of words that are alike or nearly alike in sound but different in meaning; a play on words.

(http://dictionary.reference.com/)

Example: