How can you lift an elephant with one hand?
Q: How can you lift an elephant with one hand?
A. Who cares? You will never find an elephant with one hand anyway.
This is a riddle in the standard Q and A format. This is also sort of an elephant joke, since it has an elephant in it.
The humor in this joke relies on the ambiguity of language. The listener hears "how do you lift an elephant using only one of your hands (instead of both of them)", and the jokester instead answers the question "how do you list an elephant that has one hand".