In the class Web Basics I learned the content of a website shall adapt to the dimensions of the browser window. Wanna crash my trash? takes that literally. I associated the physical process of crushing to the browser interaction. When minimizing the browser window, the content gets crushed. You can see this as a kind of garbage compactor, that is crashing your daily trash.
There are three items to choose from: a Coca Cola can, a tea package and a milk carton. All of them can be crushed individually. Notice that all of them are in the same proportion. So you can actually compare how the coke can looks like when it's exactly the length of the tea package.
On the start page, where you can choose the item to crush, there is another effect that aims realism. When hovering over an item it gets highlighted by coming into the foreground. This is done again with photography instead of using some web techniques that would just enlarge the picture. The result is that the shadows of an item adapt even when a neighbor item is selected.