Devin Reimer spent a lot of time just so you could enjoy a hot cup of coffee in Job Simulator.
You could pour the cup and then set it on the counter and watch it steam until it cools down to room temperature. Add some sugar or creamer and watch the color turn lighter. He estimates it took roughly 500 hours from him alone, and hundreds more from others at Owlchemy Labs, to make the liquid simulation subsystems in Job Simulator.
At Oculus Connect 3, one of the talks was interesting in which the topic was about what are the things that did NOT work well during the development of Job Simulator. This helps to highlight some of the challenges in developing for VR. Video link below.