You're likely thinking of Ursa Major, also known as The Great Bear. While not technically upside down, it's often visualized as a dipper, and in the northern hemisphere, the dipper is commonly seen "hanging" by its handle, making it appear as if it's upside down.

Here's why:

* Ursa Major's Orientation: The constellation's shape is formed by seven bright stars. The four stars that form the bowl of the dipper point towards the North Star, creating a visual arc.

* Perspective: As the Earth rotates, the position of the dipper changes. For many people in the Northern Hemisphere, the dipper is most often seen with the handle pointing upwards, creating the impression of being upside down.

It's important to remember that constellations are only patterns of stars in the sky, and our perception of them depends on our location and the time of year.