Although Humerous and direct to the poin the previous answers are. Here are the Official Statements regarding this question.
From the NSSL (National Severe Storms Labroratory) Lightning Safety Page
Utility lines and metal pipes can conduct electricity.
Do not use any electrical appliances (except those used for weather information) and unplug unnecessary ones.
Turn off air conditioners and computers to protect them from power surges.
Do not use a corded telephone except in an emergency.
Do not bathe or shower during a thunderstorm.
Avoid contact with anything that conducts electricity
Stay away from windows and doors.
Avoid contact with concrete walls or floors which may contain metal reinforcing bars; carports or open garages; covered patios; washing your hands or doing dishes.
No place is completely safe from lightning, but some places are safer than others. Although some victims are struck directly by the main lightning stroke, many victims are struck as the current moves in and along the ground.
From the NSSL FAQ Page
Is it possible to be struck by lightning while taking a shower?
Yes, because electricity can travel through water.
Other Lightning FAQ's and Safety Information
http://www.srh.noaa.gov/srh/jetstream/li…
http://www.nssl.noaa.gov/primer/lightnin…
http://newweb.wrh.noaa.gov/hnx/Lightning…
http://library.thinkquest.org/03oct/0075…
http://www.ucar.edu/communications/infop…
http://www.srh.weather.gov/srh/jetstream…
http://www.lightningmaster.com/FAQ.htm
http://www.ourbetternature.org/lightning…
LIGHTNING / THUNDERSTORM SAFETY
http://www.nssl.noaa.gov/edu/safety/ligh…
http://www.disastercenter.com/guide/thun…
http://www.lightningsafety.noaa.gov/more…
http://www.lightningsafety.noaa.gov/over…
http://www.lightningsafety.noaa.gov/
http://www.lightningsafety.noaa.gov/surv…
http://science.nasa.gov/newhome/headline…
http://www.lightningtalks.com/lightningf…
http://sky-fire.tv/index.cgi/lightning.h…
http://www.washtwpmorris.org/departments…
http://library.thinkquest.org/03oct/0075…
www.nols.edu/resources/research/pdfs/l…

