Years ago I used to work at Lowe's . One night while making the rounds I saw a lady in the hardware isle staring at the nails, looking puzzled and confused. I saw her pick up a box of nails, hold it up to her ear, and shake it. I watched her as she picked up another box and did the same. I watched this go on for awhile somewhat amused until I finally approached her and asked her if I could help her. She turned around and said "Yes you can." and then asked, in all seriousness "Which ones are the LIQUID nails?"