Up in these parts, all outdoor farts in winter are white, frozen solid in mid-air. If one wishes to share the flatulent joy with others, the frozen fart must be brought inside and warmed up to thaw it out. Most gas stations and convenience stores sell bags for this purpose; they're like dog-poop bags, sold on a roll, but emblazoned with a Canadian flag.
The better brands are equipped with little adjustable valves, to allow the release of small test samples of methane-y goodness without wasting the entire fart in one explosive blast.