SUBWAY SUB-STANDARD

I used to take the F

Until I cried
"First Aid!"

And someone explained the F

Is not a line but a grade.

Note: The Oh So Prolific One/Verse Responder will be less prolific this week. He writes: "By
the way, I’ll be away the rest of the week tangling with matters
cultural in the Tanglewoods of Massachusetts.  I’ll miss OTBKB as I’m
laptopless along with clueless."