The Lab Rat

Just imagine this A little rat in a lab did sit He was the test subject for hypertensive disease Well the blood pressure cuff was too tight too please All he could think of all day Was how he could get away Knowing that very soon The cuff would balloon The more he thought about that cuff The more his blood pressure would go up The lab team could not understand What could be wrong with this little man(rat) Then they thought that he needs to play So they placed him in a swimming tray Now he was afraid he would drown So on his face was a terrible frown