my little fish swims with a rat

I keep a fish in my classroom but one morning i got there just saw there was something strange in the jar...

Poor little rat didn't know how powerful my little fish is.He shouldn't have jumped into the jar,what he got was just the end of his life. (I believe it was the rat himself jumped into the jar,not a joke made by my classmate)

So here I am making a good display to the people come around,to tell them how brave you were,my poor little Jerry!