Reward?

I knocked on my next-door neighbour's door and handed him a huge bag of dog sh*t from my garden.
I said, "There you go mate, that's the £50 reward please."
He said, "What's this?"
I said,
I said, "There you go mate, that's the £50 reward please."
He said, "What's this?"
I said,
Spoiler: