They have those toilet seats at O'Hare airport. There is a detailed diagram showing how the used cover gets shredded when the new one comes out. There is also a digital number showing the number of fresh seats left.
Of course, I don't exactly trust the authorities at O'Hare airport for factual information. They told me my plane would board at 11am and depart at 11:20 am. We boarded at 3:15pm and took off at 4:45 pm.
But I guessing they are telling the truth about the toilet covers.
~Heather