Dilbert enters an auto service store and says to an auto mechanic, "Just a quick question: is is necessary to change my oil . . ." Dilbert continues, ". . . Or can I just keep letting it run dry and then add new oil?" The car mechanic looks shocked. The mechanic screams and falls to the ground. Dilbert looks at the reader and says, "I think the answer is going to be 'no' to that second option."