When a guy sleeps with his girlfriend knowing that he has a STD (that he has caught off someone else) - he then passes it to her and blames her for giving it to him.
Frank: "Steve, how did your girlfriend take its when you told her that you had chlamydia?"
Steve: "She felt guilty and brought me a playstaion 3"
Frank: "how did you manage that?"
Steve: "I gave her the loftus surprise"