A nun was walking in the convent when one of the priests noticed she was gaining a little weight. "Gaining a little weight are we sister Susan?" he asked.

"No, Father. Just a little gas." Sister Susan explained.

A month or so later the priest noticed that she had gained even more weight. "Gaining some weight are we Sister Susan?" he asked again.

"Oh no, Father. Just a little gas." She replied again.

A couple of months later the priest noticed Sister Susan pushing a baby carriage around the convent. He leaned over and looked in the carriage and said, "Cute little fart."