After having their 11th child, an irish couple decided enough was enough, as they could not afford a larger bed.
So the husband went to his doctor and told him that he and his wife did not want any more children.
The doctor told him there was a procedure called a vasectomy but it was expensive. So, he explained that there was a less costly alternative.
The husband was to go home, get a fire-cracker, light it,put it in a beer can and hold it up to his ear and count to ten.

The husband said to the doctor:
"B'jayzus, I may not be the most smartest man in the world, but I don't see how putting a fire-cracker in a can next to my ear is going to help me with my problem."

"Trust me, it will do the job." Said the doctor.
So the man went home,put a fire-cracker in a beer can, held it up to his ear and began to count:
1..2..3..4..5......
at which point he paused, and placed the can between his legs so he could continue counting on his other hand.

This procedure also works in New Zealand, Tasmania and several suburbs in Brisbane.