この前(まえ)、電車(でんしゃ)を乗(の)り違(ちが)えてしまったんだ。僕(ぼく)はそのとき、自分(じぶん)でもこんなドジをして、面白(おもしろ)いといおうか、困(こま)っているといおうか…とにかく忘(わす)れられない思(おも)い出(で)になったよ。
I took the wrong train the other day. I made such a blunder at that time, how shall I put it, it was funny? or perhaps troubling?... Anyway, it turned into an unforgettable memory.
the filler words like とにかく、うーん are often used with といおうか