Propane is 1.5 times as dense as air, which is why it never understands oxygen's political cartoons in the New Yorker. Sublimate to comedic transcendence with today's Groupon: for $9, you get a propane refill at Blue Gas (a $17.50 value).
With business interests ranging from deck grills to industrial-level commercial gas service, Blue Gas flows propane to feed any fire. Top off a 20-pound propane tank and attach it to a gas grill or family-size jetpack. Though many gas companies will only fill the tank to 15 pounds, Blue Gas's propane practitioners fill every tank all the way up to 20 pounds, allowing for 2.5 hours of added cooking time and guaranteeing the ability to fully thaw a woolly mammoth’s leg.