For the Marines!

Beyond comprehension, it beggars belief... Over the top, you're joking...good grief! Leaving me speechless, aghast and agog... Let's have that again, my mind's in a fog! Once more it is uttered, credulity's stretched... C'mon, pull the other, 'tis just too far-fetched! Kissing the Blarney, you're doing just fine... So tall a story...first letter, each line! !