Oxymoron: A rhetorical figure in which incongruous or contradicting terms are combined
ex. "seriously funny", "to make haste slowly", "pretty ugly"
Parenthesis: an amplifying or explanatory word, phrase, or sentence, inserted in a passage from which is usually set off by punctuation; remark or passage that departs from theme of discourse; one or both of the curved marks ( ) used in writing and printing to enclose a parenthetical expression or to group a symbolic unit in a logical or mathematical expression