Inspired by reddit feats like http://i.imgur.com/DVIRB.png
, I think we can make this "you're thinking of" an actual forum game.
For those of you who didn't read the link, it goes like this (minus the italic help guides, of course)
Kindle. (Starting word)
What, to light a fire? (Initial misunderstanding)
You are thinking of kindling. Kindle is a kind of hollow chocolate egg which contains a plastic toy. (The start of infinite clarifications)
No, that's a Kindler Egg. Kindle is a grade level in school for young children. (The follow up answer, with a setup for the next one.)
No, that's kindergarden. Kindle is a mall doll that accompanies Barbie. (And it continues for a long time, or at least until we want to restart.)