I know what you're talking about. I've always thought it had more to do with the concept of resonant frequency or something like that. I mean, it's most likely caused by a slight air current passing by, but the reason the current only shakes the one leaf is because it affects that particular leaf just right to make it flap wildly.
Last edited by TN Lone Wolf; 09-10-2016 at 08:48 PM.
Reason: Typo