Usual disclaimer here
Chapter 2: Fun and games
On returning to Bag End from the market Bilbo was more than a bit surprised the place was still standing, considering who had been left in charge. Then he heard the ruckus in the living room. Mentally bracing himself the hobbit poked his head around the door.
Possibly every cushion in Bag End had been thrown higgledy-piggledy over the floor. His nephew Frodo was kneeling on one of the larger cushions doubled over in laughter, Fili was perched on the back of Bilbo's armchair also laughing and in danger of falling off. The source of their amusement seemed to be a peeved Kili, who had a foot on two of the smaller cushions and appeared to be stuck doing the splits.
"Don't either of you help me then!" The younger prince exclaimed trying to shuffle the cushions closer together while trying to keep his balance.
"What on earth?" Bilbo asked trying to fight down his own laughter at the scene.
"Ah Bilbo!" Kili turned his head and gave Bilbo his most charming smile, "Be a friend and give me a hand will you? My dear brother seems to have left me to my fate."
The hobbit moved to comply before being stopped by his nephew's cry of "No uncle! Stay on the rocks!" His eyes wide in childish panic, Fili motioned his head to the cushions by way of explanation.
Bilbo was beginning to understand how Kili had gotten himself in his current predicament as the 'rocks' slid underfoot across the wooden floor but he eventually made it over to the dwarf, allowing Kili to use him as an anchor whilst he bought his feet together.
"Now would someone please tell me what all this is about?"
Kili gave Bilbo an are-you-stupid look before answering with "Floor is lava."
Yeah, I don't know if they'd use the word 'lava' but just go with it. I drew on personal experience with this one. I found out the hard way when I was about 5 that 'floor is lava' isn't the best game to play when there's a slippery wood floor involved. My cousin's were about as much use as a couple of chocolate fireguards and I was stuck until my uncle took pity on me.