Debbie was walking along the country lane with Emma, her eight year old daughter when they came upon two cows humping in the field, over the hedgerow. When Emma asked her mother what they were doing, embarrassed Debbie did some quick thinking and replied "The cow on top has hurt itself so the one underneath is carrying it."
"Well, isn't that just typical?" said Emma. "You try and do someone a good turn and all they do is turn round and fuck you."