He waited for an opportunity, when the talk was going again, and Tom was telling an absurd story about badgers and their queer ways - then he slipped the Ring on.
Merry turned towards him to say something and gave a start, and checked an exclamation. Frodo was delighted (in a way): it was his own ring all right, for Merry was staring blankly at his chair, and obviously could not see him. He got up and crept quietly away from the fireside towards the outer door.
'Hey there!' cried Tom, glancing towards him with a most seeing look in his shining eyes. 'Hey! Come Frodo, there! Where be you a-going? Old Tom Bombadil’s not as blind as that yet. Take off your golden ring! Your hand’s more fair without it.