All of my equipment had been working flawlessly for like 6 days (is that a record?) and today, I filled one of my Nova tanks. I had it on the Provari and it was gurgling. I thought I had just overfilled it a bit. I switched it to my Twist to go to work and by the time I got to my car, there was juice dripping down my arm. Ran back up 3 flights of stairs to my apartment and fortunately, I had a clean extra tank and another Twist (you should always have more than 1) Had to clean the tank, Provari and Twist. I felt really stupid and wasted 3 ml of juice and was almost late for work. The rest of the day was ok, though. The moral of the story is ALWAYS HAVE A BACKUP!!!!!!!!