Cars, and stuff.
Nice site with audio of common car issues, e.g. tapping valves, knocking, etc. - http://mycarmakesnoise.com/
Best explanation of weight transfer in braking, etc, I've seen - https://www.reddit.com/r/AskEngineers/comments/2fifvy/does_a_car_with_no_suspension_experience_weight/ck9lb2n/ - the key is force for everything is applied below center of mass at the tire contact point.
tags: cars, car, auto, vehicle