A fifth.
Because when he asked his wife how many eggs to buy, she said 4!
4: A ninja.
They only have one Tinkie-Winkie
Why is womens soccer so rare? Its quite hard to find enough women willing to wear the same outfit.
He ran out of little boys
A coal mining company puts miners in shafts.
At the bottom of the fifth the bags were loaded.
Breaking the fifth wall.