Ha ha that made me laugh.
My odd mind imagined the following.
Cow has methane trap tool attached to bottom.
Cow starts process of methane generation and parp noises occur
Given methane is lighter than air the bag starts to fill.
Cow achieves lighter than air weight and starts to ascend.
Fear causes cow to create more gas emissions and ascend further.
As it cools cow descends and lands on something.
Insurance claims roll in
