It's Not Easy, Wearing Green.
"There were soft green slippers set ready beside each bed."
In The House Of Tom Bombadil – The Fellowship Of The Ring
Pippin dropped onto a thick mattress and picked up one green slipper. Curious, he held it up against the sole of his foot, discovering that it would probably fit.
Merry watched as he dried his hands and face. "Do you think we ought to tell him we don't?"
Frodo gathered up a pair and sat on the mattress next to Pippin. "Maybe he hasn't noticed that we don't. We wouldn't want to offend him." He slid first one foot and then the other into the supple green suede and stood up.
With a grimace, Sam followed suit and then remained perfectly still, as though his feet had been nailed to the floorboards. Pippin shrugged, ramming his feet into the footwear and, not to be outdone, Merry did the same.
"Now what?" asked Merry, feet planted firmly on the floor.
"We walk, I suppose," answered Pippin. He took two steps and came to a sudden stop with a yelp.
Sam yelped too.
At Pippin's first step his slipper came off with such forward velocity that it flew across the room to hit Sam squarely on the shin. His second step had not been quite so forceful, resulting in that slipper only sliding forward. However, when he lowered his foot the heel ended up half in and half out, and it was landing with his full weight on the back edge of the slipper that had elicited his yelp.
Pippin jumped out of the offending slipper. "That didn't go well." He crossed to a scowling but still frozen Sam and reclaimed his footwear with a shrug of apology.
Merry slid a foot along the floor and followed it with the other. "There must be a knack to this," he muttered as he began a slow circuit of the room, arms swinging from side to side and looking, for all the world, as though he were wading through treacle.
Frodo lifted his foot, tilting it upward at once as he felt the slipper begin to drop off. When he brought his foot down again the back of the footwear landed first however and the whole thing just fell off to one side. He too yelped as his arch landed along the hard edge of the sole and he began to hop about the room with his foot in his hands.
Sam remained perfectly still, hoping that someone . . . anyone . . . would work out how to walk in these things.
Pippin looked from the frozen Sam to the slithering Merry and then to a hopping Frodo and couldn't help himself. He started to snigger. When the others turned to him in question the snigger became a giggle and the giggle grew into a guffaw. Merry had never been able to resist his cousin's giggle and he began to snort and chuckle too, quickly followed by Frodo. Even Sam began to see the ludicrous side.
By the time Tom came to find out what had happened to his tardy supper guests all four hobbits were rolling on the floor helplessly, surrounded by an abandoned scattering of soft green slippers.