The Pirelli Cinturato All Season tyre gets the alternative of being given a Seal Inside Technology that may keep tyre pressure after staying punctured by a nail.
The inner main of the tyre is made from a thick sticky mastic; if the tyre is normally punctured by a nail the mastic will quickly build a seal around the nail stopping any lack of oxygen and retaining tyre pressure. In the event that you were to eliminate the nail from the tyre, the sticky mastic will observe the nail out of your tyre and seal the hole. In real life this would mean forget about flat tyres.