Twice

Hearing a scream from his bedroom, the husband burst in to see someone leaping out of the window. His wife, sitting bolt upright in bed screams at him, "Stop him! That man just raped me... twice!"

The husband, skidding to a stop by the window, yelled, "Twice? Why the hell didn't you call for me after the first time?"

"Well," his wife replied, "I thought it was you... until he started for the second one."