NSFW: This Irish Mammy Can NOT Get Her Head Around This Riddle

Fair warning: you will need your headphones for this one and if you're at all sensitive to bad language, you might want to give it a skip...  The "30 cows in a field" riddle has done the rounds in the last few weeks via Facebook and beyond. It's a bit of a head-scratcher alright, but this poor woman just can't grasp it at all. And her family's teasing is not helping at all. This gets heated. Since it was posted online yesterday, the video has been shared more than 5,000 times.