The village idiot was sat on the parapet of the bridge, fishing rod in hand when along came the village college professo. "Ha ha," said the latter "You'll not catch anything doing that."
"Yus I will." said the happy chappy.
"Don't be stupid," retorted the professor, "Its a railway bridge."
"Still catch something." said the chappie.
" Well then," sneered the professor "What have you caught today?"
"You." came the retort.