I'll post more if you guys like this. Here it is: Three sons are mentioned in their grandfather's will. They all have the opportunity to claim their inheritance, but they must fill up an entire room with something that will fit in a pocket. The room is large, 20 feet by 20 feet, and is part of a storage complex. The first son tries buying as many packages of confetti he can fit, but it fails to fill the entire room. The second tries to buy a plug in fabreeze air freshener, but the scent does not reach the far corners of the room. Technically, the air particles would spread, but the room is not "filled," so to speak, with the particles or the scent. The third son succeeds. What did he buy? [b]Guesses that aren't correct will go here:[/b] Air- first of all, it isn't a common item that could be purchased in a local store. I've said that it wouldn't fill the room 100% as well, similar to the smell scenario, due to the fact that the amount purchased would not be distinguishable from the air already present. The room- it seems paradoxical to fill something with itself. Since that isn't the answer I had in mind, I'm gonna say no. [b]Correct answers, since people have already gotten it:[/b] Original, guessed by FasterForward: [spoiler]Anything that produces light ie a flashlight, match, etc[/spoiler] Others: [spoiler]Charcoal that would fill the room with fire and/or smoke. I didn't think of this one, so props to Not Schruef. Music could fill the room with sound (Camwam 13) Darkness could fill the room (Deadsoul103) I changed it so nothing is a valid answer. Multiple people suggested this. At first, I though it wouldn't count since all air would need to be removed, but it doesn't explicitly say that tools cannot be used to assist in that. It just has to have the same thing as in your pocket. So if nothing is in your pocket, nothing can be in the room, even if it requires something not in the pocket, and it fits the scenario.[/spoiler]