By Charlie Jones A pilot was forced to turn around midair and return to the same airport they took off from after a horrible smell filled the cabin. The United Airlines flight was meant to fly from Frankfurt to San Francisco but not long after take-off, passengers reported a “foul” smell coming from the toilets. The cabin crew investigated and discovered one of the toilets in the seven-year-old Boeing 777 was broken. To make matters even more grim, passengers also reported the toilets overflowed and started leaking into the cabin. Despite attempts to fix the problem in the air by calling engin…