I need a holiday

 I urgently needed a few days holiday, but because I never had any leave
 due to me, I knew the Boss would not allow me to take a few days

 I thought that maybe if I acted "Mad" then he would tell me to take a
 few days off. So I hung upside down on the ceiling and made funny

 My co-worker (who's blonde) asked me what I was doing ? I told her that
 I was pretending to be a light bulb so that the Boss would think I was
 "Mad" and give me a few days off.

 A few minutes later the Boss came into the office and asked
"What are you doing ?"

 I told him I was a light bulb.
He said "You are mad - take a few days off".

 I jumped down and walked out of the office.

 When my co-worker (the blonde) followed me, the Boss asked her "...And
 where are you going?"

 (You're going to love this!)

  She said "I can't work in the dark !!!!"