A man and his wife are visiting the doctor for a check up, doc comes in and says “congratulations, you’re pregnant!”
The husband, confused, inquires, “how can that be possible? I had a vasectomy years ago”
Doc turns to the husband and says, “let me tell you a story. A man walks through the woods and encounters a cougar. Afraid and unarmed, he raises his fingers in the shape of a gun and yells ‘BANG’. The cougar drops dead”
The husband, puzzled, states, “well that isn’t possible, someone else must have shot it.”
“Exactly,” says doc.