The Big Bang Theory pilot episode

There are two men Leonard and Sheldon and they went to sperm bank for a bit of money. When they back home they met Penny her neighbor. Sheldon invite Penny to have lunch in his house and she accept. Then arrive Leonard friends, Penny asked Leonard and Sheldon a favor, they have to went to ex Penny boyfriend to take a TV. he stung the boys and Penny to  thank them the favor  she invited all the boys to dinner