Charlie is super duper into the Transformers. He's only ever seen one 3 minute clip from the Transformers Prime cartoons, but I tell him stories about the Transformers almost every night during bedtime. I just pull up the wiki pages on the various robots, and turn them into stories for him. The stories are nothing great, but he gets so excited by them!
I wasn't sure if he was really understanding the storyline, but then tonight he asked me if someone was one of the "thirteen original primes." I guess he's paying attention! I'm kind of stunned by what a great memory kids have... when they get obsessed, they can absorb so much info!
Is your LO obsessed with anything right now?