Twins
A census taker in a rural area went up to a farmhouse and knocked. When a woman came to the door, he asked her how many children she had and their ages.
She said, "Les' see now, there's the twins, Sally and Billy, they're thirty-two.
"And the twins, Seth & Beth, they're twenty-six.
"And the twins, Penny and Jenny, they're twenty-four..."
"Hold on!" said the census taker, "Did you get twins EVERY time?"
The woman answered, "Heck no, there were hundreds of times we didn't get nothin."