Police handcuffs? (police men)?

just curious... i watched a tv police camera show where a young lad had been arrested in an unmarked police car, as they waited for a police van he admitted one of his cuffs had slid down his knuckles,the police man got him out of the car praised him for being honest and said hed tried to give him some room n must have been too lenient on him, the guy said he shuda kept his gob shut cz he hates being cuffed, anway what would happen to you if you didnt say anything when your cuff slips off but yet your still complient n well behaved?