Sophia is trying to blow a medium-sized balloon to bursting for the first time. She's pretty sure she can manage the back pressure without a check valve, but is less sure that her nerves can handle the ever-enlarging and tightening rubber bomb she is about to detonate.

Sophia is trying to blow a medium-sized balloon to bursting for the first time. She's pretty sure she can manage the back pressure without a check valve, but is less sure that her nerves can handle the ever-enlarging and tightening rubber bomb she is about to detonate.