Sometimes the simplest accessories solve the biggest problems. Take this useful gadget: the i360 iMac Turntable. It's a simple rotating turntable affixed to the bottom of your iMac or Apple monitor that allows you to easily swivel the monitor from side to side. They're made to match your computer in white or aluminum, and most models even feature a tiny built-in picture frame for an added touch of personality.
I swivel my screen to the right at least three times a day to share something I'm looking at, which usually involves making sure I don't knock the monitor over or disturb whatever else is sitting on my desk. Priced around $40 depending on which model you choose, this is an inexpensive and smart solution!