Okay, I have sent your sis a birthday mail, Catz. Hope she doesn’t freak out 
Happy birthday you sexy beast?
HAHA! She got it! She forwarded it to me and was like WTF??? I snickered and told her that I sent a message out to my buddies online to wish her happy birfday.
Only one of you did it?
Lol i emailed her and she replied with
XD?
I will note this has happened at my school as a practical joke before. (I’ll paraphrase, this is from memory)
(first message was something from the professor to a student indicating about academic dishonesty/bad group work etc)
Prof,
I’m sorry if this innocence is sounding faked, but I honestly don’t know what you were talking about. I have contributed everything I can to the group project, and have been sure to use authentic sources. Could I please meet at your office to discuss this? I really can’t take an F on this assignment!
RE:
I’m sorry, but I don’t know which E-mail you’re referring to.
(turned out one of the classmates had played a prank, and spoofed the from and reply-to part of the header. This is technically academic dishonesty in itself, so he was owed a favor to not say anything)