Amitabh Bachchan said actor Rajinikanth used to sleep on the floor during breaks on sets of 1991 film 'Hum'. "I used to rest in my AC vehicle...Watching him be so simple, I came out of the vehicle and rested outside," Amitabh said at the audio launch of 'Vettaiyan'. He further called Rajinikanth the "supreme of all stars" he has met.