Despite possessing it for many years; Frodo Baggins seems never to have put-on the One Ring - until he was staying in The House of Tom Bombadil.
Bombadil had asked to look at The Ring, and had done a "conjuring trick" to make The Ring disappear for a few moments; before returning it to Frodo - who is uncertain that what has been returned to him, is the real Ring:
...something prompted him to make sure. He was perhaps a trifle annoyed with Tom for seeming to make so light of what even Gandalf thought so perilously important.
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.
This is significant, because Frodo is being dishonest with himself about why he wants to put-on The Ring - and doing this for the very first time.
Frodo apparently tells himself the reason that he needs to to use The Ring is to "make sure" that it is the real one - which would be a serious reason.
But this is immediately contradicted; because Frodo's subsequent behaviour is frivolous, and treats the One Ring as if it were merely a party trick.
Frodo is therefore pleased at Merry's surprised reaction by Frodo's sudden disappearance; and Frodo starts to creep quietly away, in order (presumably) to continue the joke.
(In the event, Tom Bombadil can still see Frodo, and calls him back).
In terms of what Frodo knows of the identity and nature of the One Ring, this behaviour by Frodo is shockingly shallow, and trivializes the "perilous" importance of Ring - despite Frodo's self-deception that he is annoyed at Bombadil failing to take The Ring seriously.
And, as would be expected by Frodo having knowingly misused The Ring, this action very soon has bad consequences.
The very next evening, in the Prancing Pony Inn; the Ring is able to slip itself onto Frodo's finger while his attention is diverted, make him disappear in public view; and thereby the One Ring reveals itself to servants of Mordor who are watching Frodo, who immediately report this event to the Black Riders.
By first using the One Ring frivolously, for trivial reasons; Frodo has made an act of consent that thereby gave The Ring enhanced power over him.
There is an irony on the fact that this happened in the safety of The House of Tom Bombadil - at a time when Frodo felt completely safe, and was off his guard.
And just after Bombadil has demonstrated that he was, apparently, the only being in Middle Earth over whom the One Ring has no power at all.
