The old joke goes that if you want to see time fly, throw a clock out of a window.
And there’s a saying that time flies when you’re having fun.
However, if someone throws a clock out of a window, and it hits you on the head, you probably don’t think that’s very fun.
Which, I suppose, proves the saying true. Because the clock flies until it hits you in the head and stops the fun.
This is why flight attendants announce the time when the plane lands.
Because you’ve stopped flying. You’re landing.
And, hopefully, not crashing in flames.