American tourist in the Yorkshire dales spots an old chap sat on a bench rolling something into little black balls

"Gee" he says "I love these quaint English customs. Just what is this one?"

"Ahm meckin larnin pills"

"Wow! That's great. Can I try one?"

"Aye. Fiver each"

The tourist buys half a dozen and pops the first one in his mouth

"Yuk! That tastes like sheep shit!"

"Tha's larnin..."