I use this prompt during the first week of class to get to know my students. It's an excellent exercise to stretch those writing muscles as well as making them aware that there are things which will happen throughout their day that they can and cannot control. I find doing this a few times throughout the year really centers my kids and makes for fantastic group discussion.
The prompt asks for detailed responses that incorporate adjectives and adverbs to help with imagery. It may be necessary to revisit these with your class before handing out the prompt.