Brake Fluid Addiction

A mechanic noticed his co-worker drinking brake fluid at lunch.

"What are you doing, man? You can't drink that stuff!"

"Relax," replied his co-worker, "this stuff tastes pretty good, and I don't drink it all the time."

"Seriously," the mechanic exclaimed, "that brake fluid is poison!"

"Hey, man" yelled the co-worker, "back off! I can stop any time I want."