Got the rhino farts myself. Two days into fermentation and starting to get a very pronounced (but kind of clean) sulfur smell, but nothing like the awful rotten egg smell I was getting from my (failed) first batch.
Decided to toss in another teaspoon of nutrient since I was going to pull out the blow off tube and put in my airlock...not a wise decision with a healthy fermentation already going! I still had the blow off tube and stopper set up in my hand and had to jam it back into the mouth of the carboy because foam came shooting up like a geyser. It blasted through the blow off tube for about 20-30 seconds and then stopped.
Anyway, I don't really think I did any damage, and know understand rhino farts seem to be a common occurrence, so I guess I'll give it some time and see what happens.