A nun, sister Sarah, wakes up one morning feeling great, she gets out of bed and decides to go to the kitchen for some breakfast.
On her way over there she runs into sister Jane and she says, "Hi sister Jane," to which sister Jane answers, "I see you got off on the wrong side of the bed this morning sister."
Puzzled, sister Sarah did not understand what sister Jane meant by that so she ignored it and went on.
She's passing by the garden when she runs into sister Roberta and says, "Good morning sister Roberta hope you're having a great day!"
Sister Roberta answers, "Good morning sister Sarah, I see you got off on the wrong side of the bed today."
Sarah was now really anxious to know why everybody she meets keeps saying that when she feels so great, and so she decides to go and see mother superior, who was in her office. She enters and asks mother superior, "Holy mother, everybody keeps telling me that I got off on the wrong side of the bed, but I feel great!"
The mother superior replies: "That's because you have brother John's shoes on."