Stomach ulcers are sores that form in the lining of your stomach due to erosion of the protective mucus layer. Bacteria called Helicobacter pylori or long-term use of nonsteroidal anti-inflammatory drugs, such as ibuprofen and naproxen, can cause this erosion and expose the lining of your stomach to harmful digestive juices.
Nothing good. Brake fluid is usually much higher density hydraulic fluid as well as different type than is power steering fluid. In vehicles with ABS systems it will damage sensors and seals, and in any vehicle it will result in spongy, poorly operating brakes and damaged seals.
Time to pick up a bottle of power steering oil on the way home. After you add the fluid, though, you notice a puddle of something under the engine. Within a minute of idling, the puddle is bigger by almost exactly 1 pint of power steering fluid. An odd coincidence, indeed. Checking the pump--which is buried well under the engine--reveals a lot of wet, oily stuff in the vicinity.