- Take a ruler (or other long, flat object).
- Attach a piece of adhesive tape (e.g. duct tape) to the end of the ruler, so that the tape sticks out and most of the adhesive surface is exposed.
- Place the ruler on the floor, sticky side of the tape up.
- Slide the ruler under the fridge and maneuver the tape behind the object you want to retrieve.
- Pull the ruler back until the tape picks up the object.