I typically train with no gi here: http://sbgofal.com/
Once, while visiting my mother, I visited this gym: http://www.northmobiletkd.com/
They train in the gi. So I borrowed one and during the free rolling portion of class - this happened to me...
(skip to 3:35)
I tapped before I passed out. I just knew I was passing guard. But that's ok though...
Recently, while training here: http://www.westsidemma.com/
I bought a gi. Gi chokers beware!