So last night, I was playing Super Mario 64 DS on my 3DS. I put it down right on top of my DS lite, and then bam! black screen, followed up by Mario's voice "Buh-bye!" I took it off and then "It's-a me! Mario!". The screens lit up again! Now first i was thinking that they were wirelessly connecting somehow, and because the DS lite was closed at the time, the 3DS somehow thought it was sleeping too. But now i think my 3DS came across a magnet underneath the DS lite's shell. I read something in the manual that the 3DS falls asleep around magnets. Still, funny right?