Red Cross Girl

Me: Hi, I'm D2...I know we've met before, could I get your name again?
Red Cross Girl: It's Clara!
Me: Oh, sorry, I'm so terrible with names. What's your major again?
Red Cross Girl: It's okay. Engineering physics.
Me: Well actually, it's not okay. I'm going to have to come up with a nickname for you. Hmmm, I'm a history major so henceforth you shall be called Red Cross Girl.
Red Cross Girl: (laughs) Red Cross Girl?
Me: Yes, because Clara Barton founded the Red Cross.
Red Cross Girl: But I'm not even involved with the Red Cross. Besides, what does Clara Barton have to do with engineering physics?
Me: Don't you know? Clara Barton was a physicist before she was a nurse.
(Red Cross Girl was ready to retort, but she can only laugh)