Seven one to change and the other six to sing about how good the old one was.
Two. One to change it and one to yell "Ta-daa!" when he's done.
You can't tell it's in the dark
I don't know but that reminds me of a similar joke my uncle used to tell...
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.
A sideways seven.
Aye, Aye! Arrrr! & the Seven Seas!
Good mourning, good mourning, good mourning!!!
They're both Christmith Thongs.
When the old one expects you to "do your share"