How I Met Your Mother:

After they bump into the mysterious Amy at the mall, Sam discovers that a family heirloom is the reason why her mom was in a feud with her sister and a mother, that Sam didn't know she had. Sam, along with Dena and Andrea eventually go out with Aunt Amy and totally love her. Andrea is viewed as a jinx to Tony's team, after they start losing when she is there and she is roundly booed when she appears on the Jumbotron.

After Todd uses Andrea's jinx to win money on the game, Tony and Andrea discuss her bad luck and she has to reveal a shocking secret about herself to make Tony feel better - as she is the only one that knows his secret.