1,622. One to tell the original joke, and the rest to submit give some minor variation of it! For example:
or
Three:
One to write the light bulb removal program,
one to write the light bulb insertion program, and
one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time.
or
He had no patients.
or
Do you want to grab a bite?
or
One. But for the message of light to continue, send in your donation today.
or