Insert a flash drive into a USB port on Mac OS X El Capitan. Quite likely it does this on Sierra too.
Now yank the flash drive out of its socket. OS X displays an alert that says "The disk drive was not properly ejected".
Click the Close pane on the alert to dismiss it.
It disappears in a puff of smoke.
Now this suggests ways I could improve on it. Suppose I shipped Warp Life for Mac OS X. Yes I know just assume that for the sake of argument. When you click the close button I would show an animation of: