I was in the window seat on a 737 from OKC to ATL. Noticed mx putting oil in the engine. Halfway through the flight I notice brown fluid running down the side of the engine. BING. Stewardess, please inform the pilot that there seems to be some sort of fluid leak on the right engine. She gave me some platitude, and I mentioned that I was a pilot and that fluid from an engine is usually not a good thing. Her response was - do you fly THIS type of aircraft. Ummm, no ma'am.

I just wish they would have quietly admitted that yes, there is a small problem, the pilot's know about it and it will be fixed in ATL.