In the alternative, I call “poetic license”.

But you DID bring up my favorite English teacher quips of ‘em all. (Brace yourself, I slept two hours after watching the Mets lose in 11 innings at Dodger Stadium last night.)

I regret to point out that, true to the title, (unless that was the Hallelujah of All Puns, then I doff my hat) it is NOT “an haiku”. To quote the absolute, undisputed know-it-all Michael Swan in his tireless tome “Practical English Useage”:
~The choice between ‘a’ and ‘an’ depends on pronunciation,not
spelling.
~We use ‘an’ before a vowel sound “an hour” or “an MC”, “an honor”.
~[Conversely] we use ‘a’ before a consonant sound, even if it is written as a vowel. “a university” or “a one-dollar bill”.
(-Swan, 61. Oxford University Press, 1980.)

Since the “h” is pronounced as a consonant in “haiku”, “hotel”, “housewife”…it gets the “a” article. “Historical” is one of the rare instances where either the “a/an” indefinite article might be acceptable depending on one’s accent, purely to avoid cacophony.

Sorry to be such a b*tch, dah-ling. Let’s all hope Ryan Church remembers to tag up on third before heading home next time.

Oh yeah…and before you think I’m all high and mighty, I FORGOT the password to my blog and wordpress refuses to believe I’m me. So, yeah. Duh…