Irony plays a significant role in dramas, movies, TV serials and even in the modern interpersonal communications. By analyzing the speech Obama gave in 2016 WHCD under the frame work of echoic mention theory proposed by Sperber and Wilson (1981), this study paper attempts to divide those humorous utterances into two categorizes: irony via self-mockery and irony via taunting on others. Next, the paper will be devoted to analyze cognitive process of irony interpretation in terms of conceptual blending theory. In this paper, both qualitative and quantitative method will be adopted.