Conversion to Judaism

There was once a woman who wanted to become Jewish to please her Jewish husband. So, she went to see a rabbi. After a long process, the rabbi told her to enter a mikvah and dunk her head.

The woman responded, "I just went to the beauty parlor and had my hair done. The permit cost me 20 pounds. Is there any way I can go in without dunking my head?" The rabbi paused for a minute and replied, "Well, you can go in without dunking your head, but then you'll still have a goyishe kop".