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.
This situation simply couldn't happen in the UK.
For one, our temperatures are never cold enough to instantly freeze dry a fart anyway, lol. But more importantly, and thankfully so, I believe we have laws against simply dropping your trousers in the street when you feel a fart coming on, bending over to insert said "fart balloon" valve and inflating at leisure, and then popping it back in your bag for sharing with friends and family later.
I believe the main reason for the law is that a balloon full of fart is classed as an explosive device and police therefore look on said activity as potential terrorism.
You've heard of "dirty" bombs? Hell, imagine the carnage if one of these bags should explode.......and you'd unfortunately followed through in it!!!!