A boy of three and a girl of four, were playing house one day. 

They played that they were man & wife and they were going away. 

As they knocked upon a neighbor's door, the little girl bowed low saying, "This is my husband and I'm his wife.  We're visiting you you know."

"Come in, come in," the lady at the door said, "and take yourself a seat .  I'll bring you both some lemonade and something good to eat."

She gave them each a tall glass and a cookie on a plate.  Later, she offered them a second cup of frosty lemonade.

"Oh no, thank you", the wee lass said, as she took the small boy's hand,

"We really have to go now.  My husband wet his pants"