Propane is 1.5 times as dense as air, which is why it never understands oxygen's political satire. Sublimate to comedic transcendence with today's Groupon: for $8, you get a 20-pound propane tank refill at Fuel Pro Systems (a $16.82 value).

Since 1995, Fuel Pro Systems has fulfilled the propane-related needs of recreationists looking to power barbecue grills and refill tanks. The outfit's propane-cylinder filling service station enables campers to continue cooking meals during their stay in the picturesque Okanagan Valley and enables proud locals to continue searing "Welcome" signs onto strip steaks. Plenty of parking at Fuel Pro Systems gives customers easy access to the station and a quick exit once their tank is full.