Each of us has at least one three-letter acronym we never want to hear.  Something that immediately brings to mind a terrible fear, past horror, irreversible mistake, or worst nightmare.

RIP.

WMD.

HIV.

HGH.

MIA.

IRS.

OSU.  (Sorry, Wolverine fans, couldn't resist.)

Football players have a most-feared-acronym as well:  the dreaded three letters A-C-L.

According to the most trustworthy source on the Internet—okay, I mean Wikipedia—ACL stands for "anterior cruciate ligament,"  the most commonly injured of the four major knee ligaments.  To football players, ACL means "I heard a pop," "season ending," and ...

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