A nun was walking in the convent when one of the Fathers noticed she was gaining a little weight. "Gaining a little weight are we sister Susan?", he asked.
"Oh no, Father. Just a little gas." Sister Susan explained, matter-of-factly.
A month or so later the Father 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 few months later the Father noticed Sister Susan pushing a baby carraige in the convent.
He leaned over and looked in the carraige and said -
"What a cute little fart!"