I was over at my friend's horse stable and a lady got into her E350 that looked to be about an '06 or so. She started it up and I thought it sounded quite similar to my car which surprised me. Then after about 5 seconds this whirring noise starts like a jet helicopter warming up, and the sound got higher and louder and I was looking at the car like WTF? And she is just sitting in there like this is completely normal. What was that sound? I don't think she was revving the engine.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra