Zさん："... so anyway, I was thinking that, as far as US presidents go so far, Barack Obama is the second to last, making him the... the... なんでしょうか。。。"
Aさん：「Congratulations! You are an English speaker, and you could not remember an English term, and you expressed that fact using a Japanese phrase. You are officially bilingual! ... and the word you are thinking of, by the way, is 'penultimate'.」
Zさん："... um... なるほど。"
Aさん：「You did it again!」