Cable Catch

There's an easy solution to loose cables falling off of your desk - the cable catch.

To make one, you'll need:
-a plastic card you don't use (e.g. a hotel keycard)
-scissors
-a hole punch (or not, depending on your skill with scissors)
-some adhesive (e.g. poster gum, mounting square)

Step 1: Cut the Card and Punch a Hole in It

 

Step 2: Cut Out a Small Notch From the Top of the Card to the Hole

 

Step 3: Use Adhesive to Stick the Catch to the Back of Your Desk

 Then you thread the cable through the notch and it should stay in place.