[CSB] I once used my RPG to share a couple of games with a young kid in a doctor's waiting room.
He was bored with playing the same old games on his TTDS, so I asked his parents if they'd mind if I gave him some new ones. As the lad was getting restless (ok, annoyingly noisy), they said yes, no problem - anything to keep him occupied.
So we went through my game collection, and he picked out the ones that interested him.
Copied the chosen files from my microSD to NAND, put kid's microSD in the RPG, moved the files from NAND to his microSD.
It certainly helped to pass the time and keep the peace. (Bonus: the receptionist smiled and gave me the thumbs up for basically helping a small boy to pirate video games.)
I also like the fact that the kernel resides on the NAND. Leaves more room on the microSD for ROMs, homebrew, DPGs and so forth.