Which Organ

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A teacher asks his class, "Which human organ is capable of expanding to six times 
its normal size?" He calls on Jessica, the pastor's daughter.

"That's disgusting," she hisses prissily. "I won't even answer that question."

So the teacher calls on Johnny.

"That's easy," says Johnny. "It's the eye. The iris can increase to six times its size 
depending on the amount of light entering the eye through the pupil."

"Very good," responds the teacher. "That is correct."

He then turns to Jessica. "Two things," he tells her.
"First, you have a dirty mind. And second, you're in for a big disappointment."