oh god yeah that sound is ridiculous. It sounds like the icing of an amazing night. Pretty much every show/festival yeah, that hisss or "fpsssssssssss" sound is everywhere, that sound is what makes nitrous addicting to me. I hear it and I get like pumped full of energy and I get pulled towards the tank. I also try to pretty much only do it at a show or festival because I love it so much. And I only really do it after I been tripping for some time, or sometimes 30 minutes after eating something and waiting for it to kick in. I knew a guy when I was in high school, he was like 30, who had a tank and would fill it up all the time and just throw all nighters. That shit was addicting, we couldn't get ourselves to leave until the tank was done or he had to work and kick everyone out. Once he disappeared (moved, jail? dont know, just stopped answering everyone's calls) I wanted it all the time. Didn't do it for about a year and stopped fiending so bad. But that shit is DEFINITELY crack. I'm getting fiendishly excited thinking about it and writing this right now. That's why I try to only do it at shows and festies. But sometimes when I'm tripping at home or a friends I'll just buy 2 whipped cream cans for a teaser of it.