Robots

Jim-Bob: You know those robots that build the cars in factories?

Jimbo: Uh... Yeah.

Jim-Bob: Who builds them?

Jimbo: I... would imagine other robots.

Jim-Bob: OK, but who builds those robots then?

Jimbo: Um, again, I think I'm gonna have to go with other robots.

Jim-Bob: Then why don't we save ourselves a whole lot of time and energy and use THOSE robots to build the cars?

(long pause)

Jimbo: Tonight, soon after you fall asleep, prepare to be stabbed in the chest.