A guy goes into a drugstore to buy condoms. The clerk says, "What size?"
The guy says, "Gee, I don't know."
The clerk says, "Go see Sophie in aisle 4."
He goes over to see Sophie; she grabs him in the crotch, and yells, "Medium."
The guy is mortified; he hurries over to pay and get out of the store.

Another guy comes in to buy condoms, the clerk asks the size, and again sends him over to Sophie in aisle 4. Sophie grabs him and yells, "Large."
The guy struts over to the register, pays and leaves.

A high school kid comes in to buy condoms. The clerk says, "What size?"
The kid embarassedly says, "I've never done this before. I don't know what size."
The clerk sends him over to Sophie; she grabs him and yells, "Clean up in aisle 4 !"