I had a funny encounter with Garuda NM just yesterday on my DRG.
I come in, someone is new, but nobody asks what to do. The tank asks whether we all know what to do - healer says yes, but that it's his first time healing it - tank starts ready check, all are ready.

Fight commences, suddenly I am alone killing feathers, and the other DPS stands too close to the pillars, we wipe to the ultimate. I'm getting ready to explain the add phase, suddenly the other DPS explains it... O.o

I don't think I have ever been so baffled in my life.