Because of the relatively high attraction of water molecules to each other through a web of hydrogen bonds, water has a higher surface tension (72.8 millinewtons (mN) per meter at 20 °C) than most other liquids. Surface tension is an important factor in the phenomenon of capillarity.

If u want to try it : make sure u put the paper clip in THE MIDDLE OF THE CUP . Also, in case there might make the table wet, pls put a towel under the cup to make sure u don’t have to clean it