This groaner is by Gary Hallock.

In a little known chapter of the Star Wars epic, Princess Leia got pregnant and was having some difficulty delivering her baby. She began to wish that her gynecologist was still alive, but had to accept her own brother’s assistance during the difficult delivery. As she was suffering through her most painful final contractions, she shouted her late doctor’s name and asked for help, “Help me OB/GYN Kenobi!”

Suddenly a disembodied voice came from beyond the delivery room, “Use the forceps, Luke.”