Just one, but they have to do it during dinner.
Fish. I got this from bash.org a long time ago, but I can't find the original post, so have this
Ten. One to actually change the lightbulb and nine to bring refreshments
Because their Zoos ran out of room.
2. 1 to change the light bulb, the other to take pictures.
Don't worry, the dinner's on me.
No telemarketers.