Mercury Retro Grade

When I was in grade school
One of my classmate’s dad was a dentist
He would bring mercury to class
And we couldn’t resist 
He’d give us each a glob 
And what fun we had
Watching it perform
No thought that it could be bad
You could coat a penny with it 
Would turn silver right on the spot 
Like a giant amoeba
Shape shifting a lot
Watch it roll down our desk tops
On clay paths we’d create
Such a curious element
But with a dangerous fate
If it fell it would splatter
But you could reunite all the drops
Bring it all back together
A resurrected cyclops
Never knew of the danger
Couldn’t resist that mercury
Give it a retro grade of “F”
Never knew how dangerous it could be . . .