When lightning hits the ground, current flows through the earth in a wide area around the point of impact. This is how a lightning strike can kill a field full of cows - the long wheelbase of the average cow means that a nearby strike induces a significant potential difference across the ground spanned by the cow's front and back legs; current flows through cow, cow dies.
For those of you who aren't science-minded, let me break that down in layman's terms: basically lightning strikes a cow, and makes it delicious. I smell barbecue! Or a cow on fire, same difference.
The path lightning takes through a cow [tywkiwdbi]
Thanks to towhee monster, who attracts lightning like she does men -- with witchcraft.