Underwater Sandwich

My sandwich is soggy and falling apart.
The crust and the lettuce1 are floating away.
I guess that it probably wasn't too smart
to play with it here in the bathtub today.
They served them today in the lunchroom at school.
I saved mine through English and Science and Math,
then carried it home thinking won't it be cool
to play with my sandwich upstairs in the bath.
But now the baloney is starting to sink.
The mustard and mayo dissolved in the tub.
It's puzzling, but I am beginning to think
my "submarine sandwich" was not a real sub.