In knitting the topic of whether or not knitting needles are allowed on flights comes up, along with a mention of limitations on the amount of dry ice you can bring on the plane (4 pounds). When I asked who would need that much dry ice, knitpuppiessays:
My theory why someone would want to bring dry ice on a plane? TO HAVE THE MOST ROCKING CONCERT EVER!
I have to agree, that'd be a pretty rock-ass concert.