Precise joke

I was looking at the German jokes on upjoke.com. Most of them are the same joke in various forms.

Standard joke:

Q: How many Germans do you need to change a lightbulb?
A: One. We are efficient, not funny.

The standard joke is IMPRECISE. Here’s the PRECISE joke:

Q: How many Ger A:We already changed the bulb while you were wasting time asking a STUPID question.