The sheinin' reflex is a sensitive reflex that is only triggered when someone is dancing near/with you, when you are not dancing.
In chronic cases. the reflex can be triggered by sound only.
When the reflex is triggered, you start dancing, awkwardly, trying to blend in, but pulling too much attention, making you "shine" on the dance floor.
Dude #1: "Check out Dan, he is doing the macarena
, what the hell just happened here?"
Dude #2 : "Haven't you heard? that chick was dancing three feet from him and it triggered his Sheinin' Reflex