A man walks into a DIY shop and asks,
"Do you have any candles?"
"No" replies the storekeeper "sorry"
The next day the same man walks into the shop again and asks,
"Do you have any candles?"
"Sorry" replies the shopkeeper "we didn't have any yesterday and we don't have any today"
This continues for several week until the shopkeeper becomes so annoyed that he shouts at the man,
"If you ask me that one more time i'm going to nail your dick to the counter and forcefeed you laxatives!"
Shocked the man walks out of the shop
The next day he returns to the shop and asks
"Do you have any nails or laxatives?"
"Thank God you didn't ask for candles, no we don't i'm afraid"
"Do you have any candles?"