It used to really torque my turkey when guys would rev their engines. Like, I'd be about to get into their fancy car or truck (or their piece of junk, whichever), and they'd be sitting there revving the engine and grinning at me like I was supposed to be reeeeally impressed.
Maybe I was annoyed because they didn't bother to get out and open my door, or maybe because I couldn't care less about car-related anything. Or maybe I just don't like people.