A man was idling in the street, bored, when he saw a man selling apples.

He approached and asked, “How much do these apples cost?”

The vendor replied, “An apple costs £1 and an apple seed costs £2.”

Confused, the man asked, “Why are you selling the seeds for more?”

The vendor said, “Apple seeds are known to make you smarter. Why don’t you try them?”

Sceptical, the man handed over £4 and purchased two seeds. As he walked and started chewing, he realised that he could have just bought an apple and eaten those seeds. Hurrying back to the vendor, he asked, “Don’t you realise people could just buy an apple and eat those seeds instead of buying them separately?”

The vendor smiled, and said, “See? I told you you’d become smarter!”