Seven one to change and the other six to sing about how good the old one was.
Fish. I got this from bash.org a long time ago, but I can't find the original post, so have this
A nickeless cage.
Five six seven eight!
Just one but he wants to do it thirty-two times and when he's done everyone says that his last light bulb was much better.
Seven. One to install the bulb and six to figure out what to do with the old one for the next 10,000 years
Snow White's hymen
Two. One to screw in the lightbulb and another to sing about all the good times they had with the lightbulb.
All she could sing was, "Law, law, law, law, law, law, law."
Three. One to change it while the other two argue about how old the old one is.