Bloke arrives in pub looking all knackered and dishevelled.

"You all right, mate?" asked the landlord.

"Well yeah, but I've just had the weirdest experience. My car broke down a mile down the road, I was gazing helplessly at my engine wondering what to do, when a horse looked over the fence - and told me how to fix it, and I did! A talking horse!!"

"Oh yeah?" said the landlord without even raising an eyebrow, "And what colour was the horse?"

"Black..."

"You were lucky there. There's a grey horse in that field too, and he knows bugger all about engines..."