By replacing the words:

item
button
taskbar
mouse button
window

with

child
car
parking lot
sense of justice
toilet

You get the following phrase, derived from a funny windows message:

You cannot drop a child onto a car on the parking lot.

However, if you drag the child over a car without releasing the sense of justice, the toilet will open after a moment, allowing you to drop the child inside the toilet.

Windows. The possibilities are infinite.