The quadriceps femoris is composed of three "vastus" muscles and the

The quadriceps femoris is composed of three "vastus" muscles and the rectus femoris 
A muscle with the ancestor from the shaft of the femur, with insertion into the tibial tuberosity, with nerve supply from the femoral nerve, and whose action extend the leg. 

Answer is rain drops because if it’s so cold it will make sleet