OMG, he is totally melting down.
Hyphen: the sign -, used to join words to indicate that they have a combined meaning or that they are linked in the grammar of a sentence (as in pick-me-up, rock-forming ), to indicate the division of a word at the end of a line, or to indicate a missing or implied element (as in short- and long-term ).
Apostrophe: a punctuation mark ( ’ ) used to indicate either possession (e.g., Harry's book ; boys' coats ) or the omission of letters or numbers (e.g., can't ; he's ; class of ’99 ).